Réponses

2013-03-11T16:42:36+01:00

a) sin(x+pi/4) = 1/2 => x+ pi/4 = pi/6 => x = 11pi/12

                          ou  => x+ pi/4 = 5pi/6 => x = 7pi/12

 

b) cos(x - pi/3) = 1/2 => x - pi/3 = pi/3 => x = 2pi/3

                            ou  =>  x - pi/3 = -pi/3 => x = 0