I know i'm supposed to use double angle formula, but i still don't get how to get my answer. I am to Express cos^2 (2x) in terms of cos 4x.
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Do you know that ? Let .
Last edited by Prove It; May 13th 2012 at 06:00 AM.
Is it + 1 or -1 at the end?
Originally Posted by johnreal Is it + 1 or -1 at the end? Sorry it's -1. Editing...
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