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.

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- Mar 1st 2010, 06:51 PMmelvisVerifying 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. - Mar 1st 2010, 07:20 PMTKHunny
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...

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