Bonjour, 1èreS, trigonométrie :

Exprimer les réels donnés en fonction de cos x ou de sin x.

A=cos(x- \frac{\pi}{2} ) , B=cos(x- \frac{3\pi}{2}), C=cos( \frac{7\pi}{2} -x) \\ \\ D=sin(x- \frac{\pi}{2} ),E=sin(x- \frac{3\pi}{2}),F=sin( \frac{7\pi}{2} -x)

Merci d'avance pour votre aide.
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