These are the problems I have trouble with while doing a practice on this topic.

1. Factor the expression and use fundamental identities to simplify:

cos^(2)x csc^(2)x - cos^(2)x

2. Find all solutions in the interval [0 , 2pi)

tan^(2)θ = (-3/2)secθ

3. Find an expression that completes the identity

[2sin^(2)x + cos(2x)] / csc(x) =

It would be helpful if u could explain step by step. I'm not just looking for answers. Thanks