Question

Rewrite with only sinx and cosx.
cos2x+sinx

Answer 1

use cos2x=cos^2x-sin^2x

Answer 2

1) Don't post problems with no work shown - work that YOU produced.
2) It appears random231 wants you to think about the double angle formulas.

Answer 3

Once I have cos^2x - sin^2x + sin x
How can I simplify it further?

Answer 4

well you can write cos^2x as 1-sin^2x. now all your terms are in sin form

Answer 5

so then I have 1-sin^2x-sin^2x+sinx
which can be simplified as 1-2sin^2x+sin x

Answer 6

thanks!