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cos x = ½
x = 60°
X = ± a + k. 360°
(0 ≤ x ≤ 360°)
untuk k = 0
x = 60° + 0. 360° = 60°
untuk k = 1
x = -60° + 1. 360° = 300°
Hp : {60°, 300°}