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May 23, 2015

Homework Help: Math- gr.12 Trig.

Posted by May on Monday, January 11, 2010 at 7:15pm.

Hi, could someone explain to me how to use a counterexample in trig to prove whether something is either an identity or equation?

For ex. how would you do that with this question?

sec^2x-tan^2x= cos x

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