- sin x/2 = rad(2) + sin x/2
sin x/2 + sin x/2 = -rad(2)
2 sin x/2 = -rad(2)
sin x/2 = -rad(2)/2
x/2 = - 3/4 pi + 2 k pi
x/2 = - pi/4 + 2 k pi
da cui infine x = -3/2 pi + 4 k pi V x = - pi/2 + 4 k pi k in Z
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