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Likurg_2 [28]
3 years ago
5

Rewrite with only sin x and cos x. cos 2x + sin x

Mathematics
2 answers:
Mekhanik [1.2K]3 years ago
5 0
cos 2x+ sinx= cos^{2}x -  sin^{2}x + sin x=
  =(cosx-sinx)(cosx+sinx)+sinx
This is the expression written with only sinx and cosx.
Arturiano [62]3 years ago
5 0
Hello,

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