Question

Rewrite with only sin x and cos x.

cos 2x - sin x

Answer 1

Use a double angle identity.

Answer 2

Could you please elaborate @mathstudent55

Answer 3

cos(2x) = cos^2(x) - sin^2(x) = 2 cos^2(x) - 1 = 1 - 2 sin^2(x)

Answer 4

These are the answers

cos2x - sin2x - sin x

cos2x - sin3x

cos2x + sin2x + sin x

cos2x - 3 sin x

Answer 5

cos2x - sin2x - sin x should be the answer if that 2 means square?

Answer 6

It does. Why do you see that the answer is A?

Answer 7

\[\cos 2x= \cos^2x - \sin^2 x\]

Answer 8

Ok i'll put that as my answer. Thanks again!