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Math Help - How to calculate this trig integral?

  1. #1
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    How to calculate this trig integral?

    Can anybody help with this integral:
     \int {xcos^{2009}xdx} ?
    Thanks.
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  2. #2
    Member Nacho's Avatar
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    Santiago, Chile
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    an idea

    first integrate byr part, to eliminate that X, next you can usea the indetity

    <br />
\cos ^2 x = \frac{{1 + \cos \left( {2x} \right)}}<br />
{2}<br />

    next you have to find a regularity... (wich I didn`t find it)
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  3. #3
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    Unless you've got some technique for integrating that, this looks like burnt toast, mate. =p
    Last edited by mr fantastic; April 25th 2009 at 05:28 PM.
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