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x = alfa + k . 360, dan
x = (180 - alfa) + k . 360
k = bilangan bulat
sin 2x = 1/2
sin 2x = sin 30
i)
2x = 30 + k . 360
x = 15 + k . 180
k = 0 -> x = 15
k = 1 -> x = 195
ii)
2x = (180 - 30) + k . 360
2x = 150 + k . 360
x = 75 + k . 180
k = 0 -> x = 75
k = 1 -> x = 255
HP : {15, 75, 195, 255}
Semoga Membantu,,,