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June 29, 2015

Homework Help: math trig identities

Posted by Sabrina on Thursday, January 20, 2011 at 11:03am.

a)cos4x-sin4xcot2x=-1
b)1+sinx+cosx/1+sinx-cosx=cot(x/2)
i tried to ask my teacher but she doesnt know please help me!

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