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cos 4x+sin 2x∙cos 2x

 19.12.2014
 #1
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I think you mean cos^4 x + sin^2 x . cos^2 x

\(cos^4x+sin^2xcos^2x\\=cos^2x(cos^2x+sin^2x)=cos^2x\)

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 13.07.2016

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