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persamaan trigonometri
4 cos² x – 3 = 0
cos² x = 3/4
cos x = √(3/4)
cos x = 1/2 √3 atau x = -1/2√3
interval [0° , 360°]
cos x = 1/2 √3
x = 30° atau x = 360° – 30° = 330°
cos x = -1/2 √3
x = 180° – 30° = 150°
atau
x = 180° + 30° = 210°
HP = {30° , 150° , 210° , 330°}