I have a couple problems I cannot solve, please help me!

1. tan(x)/sec(x) + cot(x)/csc(x) =sin(x)+cos(x)

2 (1-tan(x))^2 = sec^2(x) - 2tan(x)

3. sin(x)/csc(x)-1 + sin(x)/csc(x)+1 = 2tan^2(x)

4. sin(x)[sec(x)-csc(x)] = tan(x)-1

Hm.. please do not double post :)

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