Khẳng định sai \(\sin (\pi + x) = \sin x\)

A. \(\sin (\pi  + x) = \sin x\)

B. \(\sin (\frac{\pi }{2} - x) = \cos x\)

C. \(\sin (\frac{\pi }{2} + x) = \cos x\)

D. \(\sin (\pi  - x) = \sin x\)