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Verified answer
Sin²x - ¼ = 0sin²x = ¼
sin x = √¼
sin x = ½ atau sin x = -½
sin x = ½
sin x = sin 30°
x = 30
sin x = sin 150°
x = 150°
sin x = -½
sin x = sin 210°
x = 210°
sin x = sin 330°
x = 330°
hp {30°, 150°, 210°, 330°}