Angles associés
Trigonométrie
| sin (-α) = -sin α cos (-α) = cos α tan (-α) = -tan α cotan (-α) = -cotan α |
sin (2kπ - α) = -sin
α cos (2kπ - α) = cos α tan (2kπ - α) = -tan α cotan (2kπ - α) = -cotan α (k = ..., -1, 0, 1, 2, ...) |
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| sin (π -
α) = sin
α cos (π - α) = -cos α tan (π - α) = -tan α cotan (π - α) = -cotan α |
sin (π +
α) = -sin
α cos (π + α) = -cos α tan (π + α) = tan α cotan (π + α) = cotan α |
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| sin (π/2 -
α) = cos
α cos (π/2 - α) = sin α tan (π/2 - α) = cotan α cotan (π/2 - α) = tan α |
sin (π/2 +
α) = cos
α cos (π/2 + α) = -sin α tan (π/2 + α) = -cotan α cotan (π/2 + α) = -tan α |
