cos (6a) = cos 2(3a)
= 1 - 2.sin²(3a) <= ganti aja a dengan x gak masalah
= 1 - 2.sin²(3x)
Jawabannya B
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cos (6a) = cos 2(3a)
= 1 - 2.sin²(3a) <= ganti aja a dengan x gak masalah
= 1 - 2.sin²(3x)
Jawabannya B