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sin x = sin 30
x = 30 + k 2pi
k = 0 >> x = 30
x = (pi - 30 ) + k 2pi
k = 0 >> x = 150
ingat grafik fungsi sin x
dimana sin x= 0 di saat x =0 kmudian bernilai 1/2 saat x = 30° dan 150°