Question

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(cos x + sin x )(cos x + sin x ) = 1 + 2sin x . cos x

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Answer 1

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Materi : Identitas Trigonometri
Kelas : XI SMA


(cos x + sin x )(cos x + sin x ) = 1 + 2sin x . cos x 
cos^2 x + cos x. Sin x + cos x . Sin x + sin^2 x
Cos^2 x + sin^2 x + 2 sinx. Cos x
1 + 2 sinx . Cos x

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