Rewrite with only sin x and cos x.

sin 2x - cos 2x

Answer Choices:

a) 2 sinx cosx - 1+2 sin^2x

b) 2 sin x cos^2x-1+2 sin^2x

c) 2 sin x cos^2x-sin x + 1-2 sin^2x

d) 2 sin x cos^2x - 1-2 sin^2x