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cos 2x = sin x
cos 2x = cos (90 - x) -> cos nya bisa dicoret/dihilangkan
2x = 90 - x
3x = 90
x = 30
Jadi cos 2x - sin x = 0
cos 2(30) - sin 30 = 0
1/2 - 1/2 = 0
Berarti benar x nya = 30 ^^