# Homework Help: Help with proofs

1. Apr 23, 2005

### chase222

I need help solving these 2 proofs:

(sec^2x-1)/(sec^2x) = sin^2x
I am not sure what direction to go in. I know the top of the left side could be changed into:
tan^2x/sec^2x, but I don't know what to do after that.

The second one I need help with is:

cos^2x/(1+tan^2x) = cot^2x
I simplified it into:
cos^2x/sec^2x = cos^2x/sin^2x, but I don't know what to do after that. Can you help me get the next few steps of these problems? Thanks!

2. Apr 23, 2005

### Imo

remember that tanx=sinx/cosx? try that

this one is done. again, remember that cotx=1/tanx, so what is cotx in terms of sin and cos?

3. Apr 24, 2005

### nomorevishnu

chase.....u seem to be a small boy just starting to learn math....am i right?????

first problem....sec^2 x-1/sec^2 x=sin^2 x......
ie.....tan^2 x/sec^2 x=RHS
ie.....sin^2 x*cos^2 x/cos^2 x....that is equal to sin^2 x...isnt it?????/
and the second problem u have given is wrong...there is some mistake in it......dont worry..trigonometry is easy......just try to create equations urselves....solve most of them using mind...then take ur pen......because u should be learning them like drinking water....so have them in ur fingertips.....