I've worked it down to simply cosx on the left side, but the other side is very annoying and confusing.
Last edited by mr fantastic; May 14th 2010 at 09:35 PM.
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We need some double-angle identities: . . . . Prove that: .
We have: .
Last edited by mr fantastic; May 14th 2010 at 09:34 PM.
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