Question

Rewrite with only sin x and cos x.

cos 2x + sin x

Answer 1

\(\cos 2x = \cos^2x-\sin^2x\), so \(\cos 2x+\sin x = \cos^2 x-\sin^2x+\sin x\).

Answer 2

1 + 3 sin^2x

Answer 3

What do you want done with that?

Answer 4

no thats my anserw :) is that right

Answer 5

No. How are you getting that? See my original response.

Answer 6

1 - 2 sin2x + sin x

Answer 7

Yep, that works (or \(2\,\cos^2 x - 1+\sin x\)).

Answer 8

1 + 2 sin^2x + sin x could it be this one too?

Answer 9

No, you need the minus sign there. \(1-2\,\sin^2 x +\sin x\) is totally fine.

Answer 10

thanks :))