SOLUTION: use definitions of trig functions to prove the identity. 1+tan squared theta = sec squared theta

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Question 196083: use definitions of trig functions to prove the identity.
1+tan squared theta = sec squared theta
Answer by Alan3354(21605) About Me  (Show Source):
You can put this solution on YOUR website!
use definitions of trig functions to prove the identity.
1+tan squared theta = sec squared theta
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Can I use that one?
If not, multiply thru by cos^2
cos^2 + sin^2 = 1.
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The problem with these is knowing what identities are acceptable as already proven.