Réponses

2013-05-25T20:49:54+02:00

Ex14:
b) cos²x = 1 - sin²x = 1 - (2/3)² = 1 - 4/9 = 5/9
    cosx = racine(5)/3

 

Ex15:
b) sin²a = 1 - cos²a = 1 - (1/5)² = 1 - 1/25 = 24/25
    sina = racine(24)/5