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Verified answer
TriGonoMetRisin² 2x - 2 sin x cos x - 2 = 0
sin² 2x - sin 2x - 2 = 0
(sin 2x - 2)(sin 2x + 1) = 0
Yg memenuhi :
sin 2x + 1 = 0
sin 2x = -1
sin 2x = sin 270°
2x = 270°
x = 135° ✔
sin 2x = sin (360° + 270°)
2x = 630°
x = 315° ✔
Interval : 0 ≤ x ≤ 360°
HP = {135° , 315°} ✔