Hi. It's been some time since I've done any trig work. BTW, I'm sorry to doublepost in the calc forum, meant to post here.

Could anyone guide me through these particular problems?

I need the derivatives of the following:

1. (2 sin x)/(1+cos x)

2. (5 tan x)/(x)

3. (-8xsinxcosx)

4. (tan x - 3)/(sec x)

Also, can anyone briefly tell me what the following are equal to?

sin^2 x

cos^2 x

tan^2 x

sec^2 x

And then, how to use them in conjunction with each other.