Question

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

Answer 1

A. 2 sin^2x-2sinxcosx - 1
B. 2 sin x
C. 2 sin^2x + 2 sin x cos x - 1
D. 2 sin^2x - 2 sin x cos x - 1

Answer 2

My work:
2 sin x cos x - (1 - 2 sin^2x)
2 sin x cos x - 1 + 2 sin^2x

And if I rearrange it,
2sin^2x + 2 sin x cos x - 1. Therefore, my answer is C.

Answer 3

i got that too..

Answer 4

Yay! :D