Find tan3x in terms of tanx.
Not sure where my starting point is?
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Start with the formula for . Use that to find a formula for tan(2x) and then use tan(3x)= tan(2x+ x).
Last edited by mr fantastic; Mar 1st 2009 at 06:16 PM.
Reason: Fixed some latex, deleted comments about original thread title (there's a new title now ....)
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