1. ## Proving Identities

I have to prove the following identity, and i'm not understanding this question

$sin2x / 1-cos2x =cotx$

not sure if i did that right, sin2x is the numerator and 1-cosx is the denominator and they have to equal cotx

Thank you

2. Expand $\sin 2x$ and $\cos 2x$ using the double angle identities and use the fact that $1-\cos ^2 x = \sin^2 x$ The answer follows trivially.

3. Right, i forgot about the double angle identities, thank you so much