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(2sin x + 1)(sin x - 2) = 0
sin x = - 1/2 atau sin x = 2 (tidak memenuhi)
sin x = sin 210
x = 210 + k.360
k = 0 maka x = 210
x = (180 - 210) + k.360
= - 30 + k.360
k = 1 maka x = 330
HP: {210, 330}