Bonjour,

1) sachant que tan a = -1/2 calculer :
tan (2a) , cos (2a) , sin (2a)

2) Écrire en fonction de cos (2x) :
A = 5cos(carré)x - 3sin(carré)x
B = 2cos(carré)x + 3sin(carré)x - 4sin(carré)x.cos(carré)x
C= cos(puissance 4)x - sin(puissance 4)x

Merci d'avance
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