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10-06-2016
Mathematics

contestada

Rewrite with only sin x and cos x.

cos 2x + sin x

Respuesta :

10-06-2016

Hello,

as cos 2x=cos²x-sin²x=1-2sin²x
then
cos 2x+sin x=-2sin² x+sin x +1

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HomertheGenius HomertheGenius

11-06-2016

[tex]cos 2x+ sinx= cos^{2}x - sin^{2}x + sin x=
=(cosx-sinx)(cosx+sinx)+sinx [/tex]
This is the expression written with only sinx and cosx.

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