Cos 2x= sin 30 (trigonometri

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★★★ Trigonometri ★★★

cos 2x = sin 30°
cos 2x = cos (90°-60°)
cos 2x = cos 60°
2x = 60°
x = 30°

x= +/- 30 + k360°
gunakan nilai negatif

x = -30 + 360 => k = 1
= 330

Hp ={30,330}