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What have you tried so far, have you tried any identities?
Yes, I understand
Either using or putting gives:
Hence , thus .
More generally, if is even, then:
Last edited by TheCoffeeMachine; Feb 12th 2011 at 01:15 AM.
this was a question of http://www.mathhelpforum.com/math-he...st-169383.html
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