Tentukan himpunan penyelesaian untuk 0 ≤ x ≤ 360
a. cos x = cos 30
b. cos 2x = sin 60
a. cos x = cos 30
b. cos 2x = sin 60
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x = 30 + k.360 HP : [30]
k=0⇒x = 30
k=1⇒x = 390 (tdk memenuhi syarat)