Hi, I just got slipped up on a few problems here, not sure which angle to attack from all thetas will be x, since i am ignorant about symbols, etc

Simplify

1. (2sinxcosx + 2cosx)/(cosx((sin^2)x - 1))

2. (tanx + tanxsinx - cosxsinx)/(sinxtanx)

3. [(coxtanx)/tan(90degrees - x)] - 1/(sin(90degrees - x))

4. [(2 + (tan^2)x)/(sec^2)x] - 1

Any help is much appreciated

Thanks so much