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2 cos 3x = -1
cos 3x = -1/2
cos 3x = cos 120
3x = 120 + k.360
x = 40 + k.120
atau
3x = -120 + k.360
x = -40 + k.120
k = 0, x = 40, -40
k = 1, x = 160, 80
k = 2, x = 280, 200
HP tergantung intervalnya ?