bdbtaylabeN
bdbtaylabeN bdbtaylabeN
  • 10-06-2016
  • Mathematics
contestada

Rewrite with only sin x and cos x.

cos 2x + sin x

Respuesta :

caylus
caylus caylus
  • 10-06-2016
Hello,

as cos 2x=cos²x-sin²x=1-2sin²x
then
cos 2x+sin x=-2sin² x+sin x +1
Answer Link
HomertheGenius
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.
Answer Link

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