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
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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