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Math Help - Integration

  1. #1
    Junior Member
    Joined
    Oct 2010
    Posts
    28

    Arrow Integration

    Hi,
    I am still bad in integration, I do not know which way to choose, integration by part or substination.
    integration x^2cos(x)
    So I shoul do like this
    integration x^2cos(x)=x^2 (-sinx)-integration2x (-sinx)
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  2. #2
    MHF Contributor
    Joined
    Mar 2010
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    Florida
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    Thanks
    5
    Yes do that and then do integration by parts again.

    \displaystyle u=2x, \ du=2dx, \ dv=-sin(x), \ v=cos(x)

    \displaystyle x^2*cos(x)-\left[2x*cos(x)-\int 2cos(x)dx\right]
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