Could anybody give me some help with these identities that I need to complete for homework? I need to have them correct with all work for tomorrow,and they need to be proofs. If I could at least get help with starting them, that would be great. Thanks.

1) (csc X - sin X)/(cot^2 X) = sin X

2) (tan X - sin X)/(sin^3 X) = (sec X)/(1+cos X)

3) ((cos X)/(1- sin X)+(1+ sin X)/(cos X)) = 2(sec X + tan X)

Again, any help will be appreciated.