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Verified answer
Materi Trigonometrisin 3x = sin 180°
Kemungkinan 1:
3x = 180° + k . 360°
x = 60° + k . 120°
k = 0, x = 60°
k = 1, x = 180°
k = 2, x = 300°
Kemungkinan 2:
3x = (180°-180°) + k. 360°
x = k. 120°
k = 1, x = 120°
k = 2, x = 240°
k = 3, x = 360°
HP = {60°, 120°, 180°, 240°, 300°, 360°}