Mathematics · JEE | TRIGONOMETRIC FUNCTIONS

Based on the unit circle definitions and symmetry shown in the coordinate diagrams (like Fig 3.7), if point \( P(a, b) \) corresponds to angle \( x \) and point \( Q(a, -b) \) corresponds to angle \( -x \), then \( \cos(-x) \) and \( \sin(-x) \) satisfy:

1. A
   \( \cos(-x) = -\cos x, \sin(-x) = -\sin x \)
2. B
   \( \cos(-x) = \cos x, \sin(-x) = -\sin x \)
3. C
   \( \cos(-x) = \cos x, \sin(-x) = \sin x \)
4. D
   \( \cos(-x) = -\cos x, \sin(-x) = \sin x \)