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September 1, 2015

Homework Help: TRIG

Posted by ALISON on Sunday, October 23, 2011 at 5:34pm.

Verify the following identity.

1) sin(x+y)
__________ = tanx+tany
cosxcosy


2) Write cos3x in terms of cosx



I cannot figure out how to solve for identities they are so hard. Any help appreciated!:)

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