Bonjour,
[tex] \frac{97\pi}{3} = \frac{96\pi}{3} + \frac{\pi}{3} = 32\pi + \frac{\pi}{3} [/tex]
Donc :
[tex]sin \frac{97\pi}{3} = sin \: \frac{\pi}{3} = \frac{ \sqrt{3} }{2} [/tex]
[tex]cos \frac{97\pi}{3} = cos \frac{\pi}{3} = \frac{1}{2} [/tex]
