# Verifying Identities

• March 1st 2010, 07:51 PM
melvis
Verifying Identities
I can't verify those 3 problems.

1. Sin^2a + Tan ^2a + Cos ^ 2 a = sec ^ 2 a.
2. (1-cosx)/1+cosx = ( cot x - csc x ) ^2
3. cots + tans = sec s csc s

thx for the help.
• March 1st 2010, 08:20 PM
TKHunny
What have you tried?

Did you go with the tried and true default backup plan and change everything to sine and cosine?

Of course, I would NOT do that with the first one. That one is just staring at you. Reach out and grab it. Quick!! It's getting away!

This should ring some bells...

$\sin^{2}(x) + \cos^{2}(x) = 1$