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(sin2x + 1) (sin2x - 3)
sin 2x = -1 atau sin 2x = 3
I.) sin 2x = sin 270
2x = 270 + k.360
x = 135 + k.180
HP : {135⁰,315⁰}
II.) sin 2x = 3 (tidak memenuhi)
Ini udah ketemu, semoga bisa membantu ^^