Can anybody help with this integral: $\displaystyle \int {xcos^{2009}xdx} $? Thanks.
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an idea first integrate byr part, to eliminate that X, next you can usea the indetity $\displaystyle \cos ^2 x = \frac{{1 + \cos \left( {2x} \right)}} {2} $ next you have to find a regularity... (wich I didn`t find it)
Unless you've got some technique for integrating that, this looks like burnt toast, mate. =p
Last edited by mr fantastic; Apr 25th 2009 at 04:28 PM.
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