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analysis.special_functions.trigonometric.basic

Trigonometric functions #

THIS FILE IS SYNCHRONIZED WITH MATHLIB4. Any changes to this file require a corresponding PR to mathlib4.

Main definitions #

This file contains the definition of π.

See also analysis.special_functions.trigonometric.inverse and analysis.special_functions.trigonometric.arctan for the inverse trigonometric functions.

See also analysis.special_functions.complex.arg and analysis.special_functions.complex.log for the complex argument function and the complex logarithm.

Main statements #

Many basic inequalities on the real trigonometric functions are established.

The continuity of the usual trigonometric functions is proved.

Several facts about the real trigonometric functions have the proofs deferred to analysis.special_functions.trigonometric.complex, as they are most easily proved by appealing to the corresponding fact for complex trigonometric functions.

See also analysis.special_functions.trigonometric.chebyshev for the multiple angle formulas in terms of Chebyshev polynomials.

Tags #

sin, cos, tan, angle

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@[continuity]
theorem complex.continuous_sin  :
continuous complex.sin
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theorem complex.continuous_on_sin {s : set ℂ} :
continuous_on complex.sin s
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@[continuity]
theorem complex.continuous_cos  :
continuous complex.cos
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theorem complex.continuous_on_cos {s : set ℂ} :
continuous_on complex.cos s
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@[continuity]
theorem complex.continuous_sinh  :
continuous complex.sinh
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@[continuity]
theorem complex.continuous_cosh  :
continuous complex.cosh
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@[continuity]
theorem real.continuous_sin  :
continuous real.sin
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theorem real.continuous_on_sin {s : set ℝ} :
continuous_on real.sin s
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@[continuity]
theorem real.continuous_cos  :
continuous real.cos
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theorem real.continuous_on_cos {s : set ℝ} :
continuous_on real.cos s
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@[continuity]
theorem real.continuous_sinh  :
continuous real.sinh
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@[continuity]
theorem real.continuous_cosh  :
continuous real.cosh
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theorem real.exists_cos_eq_zero  :
0 ∈ real.cos '' set.Icc 1 2
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@[protected]
noncomputable def real.pi  :
ℝ

The number π = 3.14159265... Defined here using choice as twice a zero of cos in [1,2], from which one can derive all its properties. For explicit bounds on π, see data.real.pi.bounds.

Equations
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@[simp]
theorem real.cos_pi_div_two  :
real.cos (real.pi / 2) = 0
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theorem real.one_le_pi_div_two  :
1 ≤ real.pi / 2
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theorem real.pi_div_two_le_two  :
real.pi / 2 ≤ 2
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theorem real.two_le_pi  :
2 ≤ real.pi
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theorem real.pi_le_four  :
real.pi ≤ 4
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theorem real.pi_pos  :
0 < real.pi
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theorem real.pi_ne_zero  :
real.pi ≠ 0
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theorem real.pi_div_two_pos  :
0 < real.pi / 2
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theorem real.two_pi_pos  :
0 < 2 * real.pi
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noncomputable def nnreal.pi  :
nnreal

π considered as a nonnegative real.

Equations
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@[simp]
theorem nnreal.coe_real_pi  :
↑nnreal.pi = real.pi
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theorem nnreal.pi_pos  :
0 < nnreal.pi
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theorem nnreal.pi_ne_zero  :
nnreal.pi ≠ 0
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@[simp]
theorem real.sin_pi  :
real.sin real.pi = 0
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@[simp]
theorem real.cos_pi  :
real.cos real.pi = -1
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@[simp]
theorem real.sin_two_pi  :
real.sin (2 * real.pi) = 0
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@[simp]
theorem real.cos_two_pi  :
real.cos (2 * real.pi) = 1
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theorem real.sin_antiperiodic  :
function.antiperiodic real.sin real.pi
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theorem real.sin_periodic  :
function.periodic real.sin (2 * real.pi)
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@[simp]
theorem real.sin_add_pi (x : ℝ) :
real.sin (x + real.pi) = -real.sin x
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@[simp]
theorem real.sin_add_two_pi (x : ℝ) :
real.sin (x + 2 * real.pi) = real.sin x
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@[simp]
theorem real.sin_sub_pi (x : ℝ) :
real.sin (x - real.pi) = -real.sin x
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@[simp]
theorem real.sin_sub_two_pi (x : ℝ) :
real.sin (x - 2 * real.pi) = real.sin x
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@[simp]
theorem real.sin_pi_sub (x : ℝ) :
real.sin (real.pi - x) = real.sin x
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@[simp]
theorem real.sin_two_pi_sub (x : ℝ) :
real.sin (2 * real.pi - x) = -real.sin x
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@[simp]
theorem real.sin_nat_mul_pi (n : ℕ) :
real.sin (↑n * real.pi) = 0
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@[simp]
theorem real.sin_int_mul_pi (n : ℤ) :
real.sin (↑n * real.pi) = 0
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@[simp]
theorem real.sin_add_nat_mul_two_pi (x : ℝ) (n : ℕ) :
real.sin (x + ↑n * (2 * real.pi)) = real.sin x
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@[simp]
theorem real.sin_add_int_mul_two_pi (x : ℝ) (n : ℤ) :
real.sin (x + ↑n * (2 * real.pi)) = real.sin x
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@[simp]
theorem real.sin_sub_nat_mul_two_pi (x : ℝ) (n : ℕ) :
real.sin (x - ↑n * (2 * real.pi)) = real.sin x
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@[simp]
theorem real.sin_sub_int_mul_two_pi (x : ℝ) (n : ℤ) :
real.sin (x - ↑n * (2 * real.pi)) = real.sin x
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@[simp]
theorem real.sin_nat_mul_two_pi_sub (x : ℝ) (n : ℕ) :
real.sin (↑n * (2 * real.pi) - x) = -real.sin x
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@[simp]
theorem real.sin_int_mul_two_pi_sub (x : ℝ) (n : ℤ) :
real.sin (↑n * (2 * real.pi) - x) = -real.sin x
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theorem real.cos_antiperiodic  :
function.antiperiodic real.cos real.pi
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theorem real.cos_periodic  :
function.periodic real.cos (2 * real.pi)
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@[simp]
theorem real.cos_add_pi (x : ℝ) :
real.cos (x + real.pi) = -real.cos x
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@[simp]
theorem real.cos_add_two_pi (x : ℝ) :
real.cos (x + 2 * real.pi) = real.cos x
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@[simp]
theorem real.cos_sub_pi (x : ℝ) :
real.cos (x - real.pi) = -real.cos x
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@[simp]
theorem real.cos_sub_two_pi (x : ℝ) :
real.cos (x - 2 * real.pi) = real.cos x
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@[simp]
theorem real.cos_pi_sub (x : ℝ) :
real.cos (real.pi - x) = -real.cos x
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@[simp]
theorem real.cos_two_pi_sub (x : ℝ) :
real.cos (2 * real.pi - x) = real.cos x
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@[simp]
theorem real.cos_nat_mul_two_pi (n : ℕ) :
real.cos (↑n * (2 * real.pi)) = 1
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@[simp]
theorem real.cos_int_mul_two_pi (n : ℤ) :
real.cos (↑n * (2 * real.pi)) = 1
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@[simp]
theorem real.cos_add_nat_mul_two_pi (x : ℝ) (n : ℕ) :
real.cos (x + ↑n * (2 * real.pi)) = real.cos x
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@[simp]
theorem real.cos_add_int_mul_two_pi (x : ℝ) (n : ℤ) :
real.cos (x + ↑n * (2 * real.pi)) = real.cos x
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@[simp]
theorem real.cos_sub_nat_mul_two_pi (x : ℝ) (n : ℕ) :
real.cos (x - ↑n * (2 * real.pi)) = real.cos x
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@[simp]
theorem real.cos_sub_int_mul_two_pi (x : ℝ) (n : ℤ) :
real.cos (x - ↑n * (2 * real.pi)) = real.cos x
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@[simp]
theorem real.cos_nat_mul_two_pi_sub (x : ℝ) (n : ℕ) :
real.cos (↑n * (2 * real.pi) - x) = real.cos x
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@[simp]
theorem real.cos_int_mul_two_pi_sub (x : ℝ) (n : ℤ) :
real.cos (↑n * (2 * real.pi) - x) = real.cos x
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@[simp]
theorem real.cos_nat_mul_two_pi_add_pi (n : ℕ) :
real.cos (↑n * (2 * real.pi) + real.pi) = -1
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@[simp]
theorem real.cos_int_mul_two_pi_add_pi (n : ℤ) :
real.cos (↑n * (2 * real.pi) + real.pi) = -1
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@[simp]
theorem real.cos_nat_mul_two_pi_sub_pi (n : ℕ) :
real.cos (↑n * (2 * real.pi) - real.pi) = -1
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@[simp]
theorem real.cos_int_mul_two_pi_sub_pi (n : ℤ) :
real.cos (↑n * (2 * real.pi) - real.pi) = -1
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theorem real.sin_pos_of_pos_of_lt_pi {x : ℝ} (h0x : 0 < x) (hxp : x < real.pi) :
0 < real.sin x
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theorem real.sin_pos_of_mem_Ioo {x : ℝ} (hx : x ∈ set.Ioo 0 real.pi) :
0 < real.sin x
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theorem real.sin_nonneg_of_mem_Icc {x : ℝ} (hx : x ∈ set.Icc 0 real.pi) :
0 ≤ real.sin x
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theorem real.sin_nonneg_of_nonneg_of_le_pi {x : ℝ} (h0x : 0 ≤ x) (hxp : x ≤ real.pi) :
0 ≤ real.sin x
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theorem real.sin_neg_of_neg_of_neg_pi_lt {x : ℝ} (hx0 : x < 0) (hpx : -real.pi < x) :
real.sin x < 0
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theorem real.sin_nonpos_of_nonnpos_of_neg_pi_le {x : ℝ} (hx0 : x ≤ 0) (hpx : -real.pi ≤ x) :
real.sin x ≤ 0
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@[simp]
theorem real.sin_pi_div_two  :
real.sin (real.pi / 2) = 1
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theorem real.sin_add_pi_div_two (x : ℝ) :
real.sin (x + real.pi / 2) = real.cos x
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theorem real.sin_sub_pi_div_two (x : ℝ) :
real.sin (x - real.pi / 2) = -real.cos x
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theorem real.sin_pi_div_two_sub (x : ℝ) :
real.sin (real.pi / 2 - x) = real.cos x
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theorem real.cos_add_pi_div_two (x : ℝ) :
real.cos (x + real.pi / 2) = -real.sin x
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theorem real.cos_sub_pi_div_two (x : ℝ) :
real.cos (x - real.pi / 2) = real.sin x
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theorem real.cos_pi_div_two_sub (x : ℝ) :
real.cos (real.pi / 2 - x) = real.sin x
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theorem real.cos_pos_of_mem_Ioo {x : ℝ} (hx : x ∈ set.Ioo (-(real.pi / 2)) (real.pi / 2)) :
0 < real.cos x
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theorem real.cos_nonneg_of_mem_Icc {x : ℝ} (hx : x ∈ set.Icc (-(real.pi / 2)) (real.pi / 2)) :
0 ≤ real.cos x
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theorem real.cos_nonneg_of_neg_pi_div_two_le_of_le {x : ℝ} (hl : -(real.pi / 2) ≤ x) (hu : x ≤ real.pi / 2) :
0 ≤ real.cos x
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theorem real.cos_neg_of_pi_div_two_lt_of_lt {x : ℝ} (hx₁ : real.pi / 2 < x) (hx₂ : x < real.pi + real.pi / 2) :
real.cos x < 0
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theorem real.cos_nonpos_of_pi_div_two_le_of_le {x : ℝ} (hx₁ : real.pi / 2 ≤ x) (hx₂ : x ≤ real.pi + real.pi / 2) :
real.cos x ≤ 0
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theorem real.sin_eq_sqrt_one_sub_cos_sq {x : ℝ} (hl : 0 ≤ x) (hu : x ≤ real.pi) :
real.sin x = √ (1 - real.cos x ^ 2)
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theorem real.cos_eq_sqrt_one_sub_sin_sq {x : ℝ} (hl : -(real.pi / 2) ≤ x) (hu : x ≤ real.pi / 2) :
real.cos x = √ (1 - real.sin x ^ 2)
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theorem real.sin_eq_zero_iff_of_lt_of_lt {x : ℝ} (hx₁ : -real.pi < x) (hx₂ : x < real.pi) :
real.sin x = 0 ↔ x = 0
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theorem real.sin_eq_zero_iff {x : ℝ} :
real.sin x = 0 ↔ ∃ (n : ℤ), ↑n * real.pi = x
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theorem real.sin_ne_zero_iff {x : ℝ} :
real.sin x ≠ 0 ↔ ∀ (n : ℤ), ↑n * real.pi ≠ x
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theorem real.sin_eq_zero_iff_cos_eq {x : ℝ} :
real.sin x = 0 ↔ real.cos x = 1 ∨ real.cos x = -1
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theorem real.cos_eq_one_iff (x : ℝ) :
real.cos x = 1 ↔ ∃ (n : ℤ), ↑n * (2 * real.pi) = x
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theorem real.cos_eq_one_iff_of_lt_of_lt {x : ℝ} (hx₁ : -(2 * real.pi) < x) (hx₂ : x < 2 * real.pi) :
real.cos x = 1 ↔ x = 0
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theorem real.cos_lt_cos_of_nonneg_of_le_pi_div_two {x y : ℝ} (hx₁ : 0 ≤ x) (hy₂ : y ≤ real.pi / 2) (hxy : x < y) :
real.cos y < real.cos x
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theorem real.cos_lt_cos_of_nonneg_of_le_pi {x y : ℝ} (hx₁ : 0 ≤ x) (hy₂ : y ≤ real.pi) (hxy : x < y) :
real.cos y < real.cos x
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theorem real.strict_anti_on_cos  :
strict_anti_on real.cos (set.Icc 0 real.pi)
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theorem real.cos_le_cos_of_nonneg_of_le_pi {x y : ℝ} (hx₁ : 0 ≤ x) (hy₂ : y ≤ real.pi) (hxy : x ≤ y) :
real.cos y ≤ real.cos x
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theorem real.sin_lt_sin_of_lt_of_le_pi_div_two {x y : ℝ} (hx₁ : -(real.pi / 2) ≤ x) (hy₂ : y ≤ real.pi / 2) (hxy : x < y) :
real.sin x < real.sin y
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theorem real.strict_mono_on_sin  :
strict_mono_on real.sin (set.Icc (-(real.pi / 2)) (real.pi / 2))
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theorem real.sin_le_sin_of_le_of_le_pi_div_two {x y : ℝ} (hx₁ : -(real.pi / 2) ≤ x) (hy₂ : y ≤ real.pi / 2) (hxy : x ≤ y) :
real.sin x ≤ real.sin y
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theorem real.inj_on_sin  :
set.inj_on real.sin (set.Icc (-(real.pi / 2)) (real.pi / 2))
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theorem real.inj_on_cos  :
set.inj_on real.cos (set.Icc 0 real.pi)
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theorem real.surj_on_sin  :
set.surj_on real.sin (set.Icc (-(real.pi / 2)) (real.pi / 2)) (set.Icc (-1) 1)
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theorem real.surj_on_cos  :
set.surj_on real.cos (set.Icc 0 real.pi) (set.Icc (-1) 1)
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theorem real.sin_mem_Icc (x : ℝ) :
real.sin x ∈ set.Icc (-1) 1
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theorem real.cos_mem_Icc (x : ℝ) :
real.cos x ∈ set.Icc (-1) 1
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theorem real.maps_to_sin (s : set ℝ) :
set.maps_to real.sin s (set.Icc (-1) 1)
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theorem real.maps_to_cos (s : set ℝ) :
set.maps_to real.cos s (set.Icc (-1) 1)
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theorem real.bij_on_sin  :
set.bij_on real.sin (set.Icc (-(real.pi / 2)) (real.pi / 2)) (set.Icc (-1) 1)
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theorem real.bij_on_cos  :
set.bij_on real.cos (set.Icc 0 real.pi) (set.Icc (-1) 1)
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@[simp]
theorem real.range_cos  :
set.range real.cos = set.Icc (-1) 1
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@[simp]
theorem real.range_sin  :
set.range real.sin = set.Icc (-1) 1
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theorem real.range_cos_infinite  :
(set.range real.cos).infinite
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theorem real.range_sin_infinite  :
(set.range real.sin).infinite
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@[simp]
noncomputable def real.sqrt_two_add_series (x : ℝ) :
ℕ → ℝ

the series sqrt_two_add_series x n is sqrt(2 + sqrt(2 + ... )) with n square roots, starting with x. We define it here because cos (pi / 2 ^ (n+1)) = sqrt_two_add_series 0 n / 2

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theorem real.sqrt_two_add_series_zero (x : ℝ) :
real.sqrt_two_add_series x 0 = x
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theorem real.sqrt_two_add_series_one  :
real.sqrt_two_add_series 0 1 = √ 2
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theorem real.sqrt_two_add_series_two  :
real.sqrt_two_add_series 0 2 = √ (2 + √ 2)
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theorem real.sqrt_two_add_series_zero_nonneg (n : ℕ) :
0 ≤ real.sqrt_two_add_series 0 n
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theorem real.sqrt_two_add_series_nonneg {x : ℝ} (h : 0 ≤ x) (n : ℕ) :
0 ≤ real.sqrt_two_add_series x n
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theorem real.sqrt_two_add_series_lt_two (n : ℕ) :
real.sqrt_two_add_series 0 n < 2
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theorem real.sqrt_two_add_series_succ (x : ℝ) (n : ℕ) :
real.sqrt_two_add_series x (n + 1) = real.sqrt_two_add_series (√ (2 + x)) n
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theorem real.sqrt_two_add_series_monotone_left {x y : ℝ} (h : x ≤ y) (n : ℕ) :
real.sqrt_two_add_series x n ≤ real.sqrt_two_add_series y n
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@[simp]
theorem real.cos_pi_over_two_pow (n : ℕ) :
real.cos (real.pi / 2 ^ (n + 1)) = real.sqrt_two_add_series 0 n / 2
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theorem real.sin_sq_pi_over_two_pow (n : ℕ) :
real.sin (real.pi / 2 ^ (n + 1)) ^ 2 = 1 - (real.sqrt_two_add_series 0 n / 2) ^ 2
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theorem real.sin_sq_pi_over_two_pow_succ (n : ℕ) :
real.sin (real.pi / 2 ^ (n + 2)) ^ 2 = 1 / 2 - real.sqrt_two_add_series 0 n / 4
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@[simp]
theorem real.sin_pi_over_two_pow_succ (n : ℕ) :
real.sin (real.pi / 2 ^ (n + 2)) = √ (2 - real.sqrt_two_add_series 0 n) / 2
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@[simp]
theorem real.cos_pi_div_four  :
real.cos (real.pi / 4) = √ 2 / 2
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@[simp]
theorem real.sin_pi_div_four  :
real.sin (real.pi / 4) = √ 2 / 2
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@[simp]
theorem real.cos_pi_div_eight  :
real.cos (real.pi / 8) = √ (2 + √ 2) / 2
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@[simp]
theorem real.sin_pi_div_eight  :
real.sin (real.pi / 8) = √ (2 - √ 2) / 2
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@[simp]
theorem real.cos_pi_div_sixteen  :
real.cos (real.pi / 16) = √ (2 + √ (2 + √ 2)) / 2
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@[simp]
theorem real.sin_pi_div_sixteen  :
real.sin (real.pi / 16) = √ (2 - √ (2 + √ 2)) / 2
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@[simp]
theorem real.cos_pi_div_thirty_two  :
real.cos (real.pi / 32) = √ (2 + √ (2 + √ (2 + √ 2))) / 2
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@[simp]
theorem real.sin_pi_div_thirty_two  :
real.sin (real.pi / 32) = √ (2 - √ (2 + √ (2 + √ 2))) / 2
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@[simp]
theorem real.cos_pi_div_three  :
real.cos (real.pi / 3) = 1 / 2

The cosine of π / 3 is 1 / 2.

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theorem real.sq_cos_pi_div_six  :
real.cos (real.pi / 6) ^ 2 = 3 / 4

The square of the cosine of π / 6 is 3 / 4 (this is sometimes more convenient than the result for cosine itself).

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@[simp]
theorem real.cos_pi_div_six  :
real.cos (real.pi / 6) = √ 3 / 2

The cosine of π / 6 is √3 / 2.

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@[simp]
theorem real.sin_pi_div_six  :
real.sin (real.pi / 6) = 1 / 2

The sine of π / 6 is 1 / 2.

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theorem real.sq_sin_pi_div_three  :
real.sin (real.pi / 3) ^ 2 = 3 / 4

The square of the sine of π / 3 is 3 / 4 (this is sometimes more convenient than the result for cosine itself).

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@[simp]
theorem real.sin_pi_div_three  :
real.sin (real.pi / 3) = √ 3 / 2

The sine of π / 3 is √3 / 2.

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noncomputable def real.sin_order_iso  :
↥(set.Icc (-(real.pi / 2)) (real.pi / 2)) ≃o ↥(set.Icc (-1) 1)

real.sin as an order_iso between [-(π / 2), π / 2] and [-1, 1].

Equations
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@[simp]
theorem real.coe_sin_order_iso_apply (x : ↥(set.Icc (-(real.pi / 2)) (real.pi / 2))) :
↑(⇑real.sin_order_iso x) = real.sin ↑x
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theorem real.sin_order_iso_apply (x : ↥(set.Icc (-(real.pi / 2)) (real.pi / 2))) :
⇑real.sin_order_iso x = ⟨real.sin ↑x, _⟩
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@[simp]
theorem real.tan_pi_div_four  :
real.tan (real.pi / 4) = 1
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@[simp]
theorem real.tan_pi_div_two  :
real.tan (real.pi / 2) = 0
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theorem real.tan_pos_of_pos_of_lt_pi_div_two {x : ℝ} (h0x : 0 < x) (hxp : x < real.pi / 2) :
0 < real.tan x
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theorem real.tan_nonneg_of_nonneg_of_le_pi_div_two {x : ℝ} (h0x : 0 ≤ x) (hxp : x ≤ real.pi / 2) :
0 ≤ real.tan x
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theorem real.tan_neg_of_neg_of_pi_div_two_lt {x : ℝ} (hx0 : x < 0) (hpx : -(real.pi / 2) < x) :
real.tan x < 0
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theorem real.tan_nonpos_of_nonpos_of_neg_pi_div_two_le {x : ℝ} (hx0 : x ≤ 0) (hpx : -(real.pi / 2) ≤ x) :
real.tan x ≤ 0
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theorem real.tan_lt_tan_of_nonneg_of_lt_pi_div_two {x y : ℝ} (hx₁ : 0 ≤ x) (hy₂ : y < real.pi / 2) (hxy : x < y) :
real.tan x < real.tan y
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theorem real.tan_lt_tan_of_lt_of_lt_pi_div_two {x y : ℝ} (hx₁ : -(real.pi / 2) < x) (hy₂ : y < real.pi / 2) (hxy : x < y) :
real.tan x < real.tan y
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theorem real.strict_mono_on_tan  :
strict_mono_on real.tan (set.Ioo (-(real.pi / 2)) (real.pi / 2))
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theorem real.inj_on_tan  :
set.inj_on real.tan (set.Ioo (-(real.pi / 2)) (real.pi / 2))
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theorem real.tan_inj_of_lt_of_lt_pi_div_two {x y : ℝ} (hx₁ : -(real.pi / 2) < x) (hx₂ : x < real.pi / 2) (hy₁ : -(real.pi / 2) < y) (hy₂ : y < real.pi / 2) (hxy : real.tan x = real.tan y) :
x = y
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theorem real.tan_periodic  :
function.periodic real.tan real.pi
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theorem real.tan_add_pi (x : ℝ) :
real.tan (x + real.pi) = real.tan x
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theorem real.tan_sub_pi (x : ℝ) :
real.tan (x - real.pi) = real.tan x
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theorem real.tan_pi_sub (x : ℝ) :
real.tan (real.pi - x) = -real.tan x
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theorem real.tan_pi_div_two_sub (x : ℝ) :
real.tan (real.pi / 2 - x) = (real.tan x)⁻¹
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theorem real.tan_nat_mul_pi (n : ℕ) :
real.tan (↑n * real.pi) = 0
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theorem real.tan_int_mul_pi (n : ℤ) :
real.tan (↑n * real.pi) = 0
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theorem real.tan_add_nat_mul_pi (x : ℝ) (n : ℕ) :
real.tan (x + ↑n * real.pi) = real.tan x
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theorem real.tan_add_int_mul_pi (x : ℝ) (n : ℤ) :
real.tan (x + ↑n * real.pi) = real.tan x
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theorem real.tan_sub_nat_mul_pi (x : ℝ) (n : ℕ) :
real.tan (x - ↑n * real.pi) = real.tan x
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theorem real.tan_sub_int_mul_pi (x : ℝ) (n : ℤ) :
real.tan (x - ↑n * real.pi) = real.tan x
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theorem real.tan_nat_mul_pi_sub (x : ℝ) (n : ℕ) :
real.tan (↑n * real.pi - x) = -real.tan x
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theorem real.tan_int_mul_pi_sub (x : ℝ) (n : ℤ) :
real.tan (↑n * real.pi - x) = -real.tan x
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theorem real.tendsto_sin_pi_div_two  :
filter.tendsto real.sin (nhds_within (real.pi / 2) (set.Iio (real.pi / 2))) (nhds 1)
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theorem real.tendsto_cos_pi_div_two  :
filter.tendsto real.cos (nhds_within (real.pi / 2) (set.Iio (real.pi / 2))) (nhds_within 0 (set.Ioi 0))
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theorem real.tendsto_tan_pi_div_two  :
filter.tendsto real.tan (nhds_within (real.pi / 2) (set.Iio (real.pi / 2))) filter.at_top
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theorem real.tendsto_sin_neg_pi_div_two  :
filter.tendsto real.sin (nhds_within (-(real.pi / 2)) (set.Ioi (-(real.pi / 2)))) (nhds (-1))
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theorem real.tendsto_cos_neg_pi_div_two  :
filter.tendsto real.cos (nhds_within (-(real.pi / 2)) (set.Ioi (-(real.pi / 2)))) (nhds_within 0 (set.Ioi 0))
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theorem real.tendsto_tan_neg_pi_div_two  :
filter.tendsto real.tan (nhds_within (-(real.pi / 2)) (set.Ioi (-(real.pi / 2)))) filter.at_bot
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theorem complex.sin_eq_zero_iff_cos_eq {z : ℂ} :
complex.sin z = 0 ↔ complex.cos z = 1 ∨ complex.cos z = -1
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@[simp]
theorem complex.cos_pi_div_two  :
complex.cos (↑real.pi / 2) = 0
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@[simp]
theorem complex.sin_pi_div_two  :
complex.sin (↑real.pi / 2) = 1
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@[simp]
theorem complex.sin_pi  :
complex.sin ↑real.pi = 0
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@[simp]
theorem complex.cos_pi  :
complex.cos ↑real.pi = -1
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@[simp]
theorem complex.sin_two_pi  :
complex.sin (2 * ↑real.pi) = 0
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@[simp]
theorem complex.cos_two_pi  :
complex.cos (2 * ↑real.pi) = 1
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theorem complex.sin_antiperiodic  :
function.antiperiodic complex.sin ↑real.pi
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theorem complex.sin_periodic  :
function.periodic complex.sin (2 * ↑real.pi)
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theorem complex.sin_add_pi (x : ℂ) :
complex.sin (x + ↑real.pi) = -complex.sin x
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theorem complex.sin_add_two_pi (x : ℂ) :
complex.sin (x + 2 * ↑real.pi) = complex.sin x
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theorem complex.sin_sub_pi (x : ℂ) :
complex.sin (x - ↑real.pi) = -complex.sin x
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theorem complex.sin_sub_two_pi (x : ℂ) :
complex.sin (x - 2 * ↑real.pi) = complex.sin x
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theorem complex.sin_pi_sub (x : ℂ) :
complex.sin (↑real.pi - x) = complex.sin x
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theorem complex.sin_two_pi_sub (x : ℂ) :
complex.sin (2 * ↑real.pi - x) = -complex.sin x
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theorem complex.sin_nat_mul_pi (n : ℕ) :
complex.sin (↑n * ↑real.pi) = 0
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theorem complex.sin_int_mul_pi (n : ℤ) :
complex.sin (↑n * ↑real.pi) = 0
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theorem complex.sin_add_nat_mul_two_pi (x : ℂ) (n : ℕ) :
complex.sin (x + ↑n * (2 * ↑real.pi)) = complex.sin x
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theorem complex.sin_add_int_mul_two_pi (x : ℂ) (n : ℤ) :
complex.sin (x + ↑n * (2 * ↑real.pi)) = complex.sin x
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theorem complex.sin_sub_nat_mul_two_pi (x : ℂ) (n : ℕ) :
complex.sin (x - ↑n * (2 * ↑real.pi)) = complex.sin x
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theorem complex.sin_sub_int_mul_two_pi (x : ℂ) (n : ℤ) :
complex.sin (x - ↑n * (2 * ↑real.pi)) = complex.sin x
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theorem complex.sin_nat_mul_two_pi_sub (x : ℂ) (n : ℕ) :
complex.sin (↑n * (2 * ↑real.pi) - x) = -complex.sin x
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theorem complex.sin_int_mul_two_pi_sub (x : ℂ) (n : ℤ) :
complex.sin (↑n * (2 * ↑real.pi) - x) = -complex.sin x
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theorem complex.cos_antiperiodic  :
function.antiperiodic complex.cos ↑real.pi
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theorem complex.cos_periodic  :
function.periodic complex.cos (2 * ↑real.pi)
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theorem complex.cos_add_pi (x : ℂ) :
complex.cos (x + ↑real.pi) = -complex.cos x
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theorem complex.cos_add_two_pi (x : ℂ) :
complex.cos (x + 2 * ↑real.pi) = complex.cos x
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theorem complex.cos_sub_pi (x : ℂ) :
complex.cos (x - ↑real.pi) = -complex.cos x
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theorem complex.cos_sub_two_pi (x : ℂ) :
complex.cos (x - 2 * ↑real.pi) = complex.cos x
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theorem complex.cos_pi_sub (x : ℂ) :
complex.cos (↑real.pi - x) = -complex.cos x
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theorem complex.cos_two_pi_sub (x : ℂ) :
complex.cos (2 * ↑real.pi - x) = complex.cos x
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theorem complex.cos_nat_mul_two_pi (n : ℕ) :
complex.cos (↑n * (2 * ↑real.pi)) = 1
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theorem complex.cos_int_mul_two_pi (n : ℤ) :
complex.cos (↑n * (2 * ↑real.pi)) = 1
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theorem complex.cos_add_nat_mul_two_pi (x : ℂ) (n : ℕ) :
complex.cos (x + ↑n * (2 * ↑real.pi)) = complex.cos x
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theorem complex.cos_add_int_mul_two_pi (x : ℂ) (n : ℤ) :
complex.cos (x + ↑n * (2 * ↑real.pi)) = complex.cos x
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theorem complex.cos_sub_nat_mul_two_pi (x : ℂ) (n : ℕ) :
complex.cos (x - ↑n * (2 * ↑real.pi)) = complex.cos x
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theorem complex.cos_sub_int_mul_two_pi (x : ℂ) (n : ℤ) :
complex.cos (x - ↑n * (2 * ↑real.pi)) = complex.cos x
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theorem complex.cos_nat_mul_two_pi_sub (x : ℂ) (n : ℕ) :
complex.cos (↑n * (2 * ↑real.pi) - x) = complex.cos x
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theorem complex.cos_int_mul_two_pi_sub (x : ℂ) (n : ℤ) :
complex.cos (↑n * (2 * ↑real.pi) - x) = complex.cos x
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theorem complex.cos_nat_mul_two_pi_add_pi (n : ℕ) :
complex.cos (↑n * (2 * ↑real.pi) + ↑real.pi) = -1
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theorem complex.cos_int_mul_two_pi_add_pi (n : ℤ) :
complex.cos (↑n * (2 * ↑real.pi) + ↑real.pi) = -1
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theorem complex.cos_nat_mul_two_pi_sub_pi (n : ℕ) :
complex.cos (↑n * (2 * ↑real.pi) - ↑real.pi) = -1
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theorem complex.cos_int_mul_two_pi_sub_pi (n : ℤ) :
complex.cos (↑n * (2 * ↑real.pi) - ↑real.pi) = -1
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theorem complex.sin_add_pi_div_two (x : ℂ) :
complex.sin (x + ↑real.pi / 2) = complex.cos x
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theorem complex.sin_sub_pi_div_two (x : ℂ) :
complex.sin (x - ↑real.pi / 2) = -complex.cos x
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theorem complex.sin_pi_div_two_sub (x : ℂ) :
complex.sin (↑real.pi / 2 - x) = complex.cos x
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theorem complex.cos_add_pi_div_two (x : ℂ) :
complex.cos (x + ↑real.pi / 2) = -complex.sin x
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theorem complex.cos_sub_pi_div_two (x : ℂ) :
complex.cos (x - ↑real.pi / 2) = complex.sin x
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theorem complex.cos_pi_div_two_sub (x : ℂ) :
complex.cos (↑real.pi / 2 - x) = complex.sin x
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theorem complex.tan_periodic  :
function.periodic complex.tan ↑real.pi
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theorem complex.tan_add_pi (x : ℂ) :
complex.tan (x + ↑real.pi) = complex.tan x
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theorem complex.tan_sub_pi (x : ℂ) :
complex.tan (x - ↑real.pi) = complex.tan x
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theorem complex.tan_pi_sub (x : ℂ) :
complex.tan (↑real.pi - x) = -complex.tan x
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theorem complex.tan_pi_div_two_sub (x : ℂ) :
complex.tan (↑real.pi / 2 - x) = (complex.tan x)⁻¹
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theorem complex.tan_nat_mul_pi (n : ℕ) :
complex.tan (↑n * ↑real.pi) = 0
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theorem complex.tan_int_mul_pi (n : ℤ) :
complex.tan (↑n * ↑real.pi) = 0
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theorem complex.tan_add_nat_mul_pi (x : ℂ) (n : ℕ) :
complex.tan (x + ↑n * ↑real.pi) = complex.tan x
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theorem complex.tan_add_int_mul_pi (x : ℂ) (n : ℤ) :
complex.tan (x + ↑n * ↑real.pi) = complex.tan x
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theorem complex.tan_sub_nat_mul_pi (x : ℂ) (n : ℕ) :
complex.tan (x - ↑n * ↑real.pi) = complex.tan x
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theorem complex.tan_sub_int_mul_pi (x : ℂ) (n : ℤ) :
complex.tan (x - ↑n * ↑real.pi) = complex.tan x
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theorem complex.tan_nat_mul_pi_sub (x : ℂ) (n : ℕ) :
complex.tan (↑n * ↑real.pi - x) = -complex.tan x
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theorem complex.tan_int_mul_pi_sub (x : ℂ) (n : ℤ) :
complex.tan (↑n * ↑real.pi - x) = -complex.tan x
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theorem complex.exp_antiperiodic  :
function.antiperiodic cexp (↑real.pi * complex.I)
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theorem complex.exp_periodic  :
function.periodic cexp (2 * ↑real.pi * complex.I)
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theorem complex.exp_mul_I_antiperiodic  :
function.antiperiodic (λ (x : ℂ), cexp (x * complex.I)) ↑real.pi
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theorem complex.exp_mul_I_periodic  :
function.periodic (λ (x : ℂ), cexp (x * complex.I)) (2 * ↑real.pi)
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@[simp]
theorem complex.exp_pi_mul_I  :
cexp (↑real.pi * complex.I) = -1
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@[simp]
theorem complex.exp_two_pi_mul_I  :
cexp (2 * ↑real.pi * complex.I) = 1
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@[simp]
theorem complex.exp_nat_mul_two_pi_mul_I (n : ℕ) :
cexp (↑n * (2 * ↑real.pi * complex.I)) = 1
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@[simp]
theorem complex.exp_int_mul_two_pi_mul_I (n : ℤ) :
cexp (↑n * (2 * ↑real.pi * complex.I)) = 1
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@[simp]
theorem complex.exp_add_pi_mul_I (z : ℂ) :
cexp (z + ↑real.pi * complex.I) = -cexp z
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@[simp]
theorem complex.exp_sub_pi_mul_I (z : ℂ) :
cexp (z - ↑real.pi * complex.I) = -cexp z
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theorem complex.abs_exp_mul_exp_add_exp_neg_le_of_abs_im_le {a b : ℝ} (ha : a ≤ 0) {z : ℂ} (hz : |z.im| ≤ b) (hb : b ≤ real.pi / 2) :
⇑complex.abs (cexp (↑a * (cexp z + cexp (-z)))) ≤ rexp (a * real.cos b * rexp |z.re|)

A supporting lemma for the Phragmen-Lindelöf principle in a horizontal strip. If z : ℂ belongs to a horizontal strip |complex.im z| ≤ b, b ≤ π / 2, and a ≤ 0, then $$\left|exp^{a\left(e^{z}+e^{-z}\right)}\right| \le e^{a\cos b \exp^{|re z|}}.$$