Question

Rewrite using only sinx and cosx.
Sin 2x - cos 2x

Answer 1

well you need the double angle information

\[\sin(2x) = 2\sin(x)\cos(x)\]

and there are a number of options for cos.

here is one

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

substitute and simplify where possible