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Math Help - integral

  1. #1
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    integral

    \int{x^3cos^2(x^2)dx}=

    substitute: u=x^2, du=2xdx

    \frac{1}{2}\int ucos^2u du

    i need help solving this from here
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  2. #2
    Math Engineering Student
    Krizalid's Avatar
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    Use \cos^2u=1-\sin^2u

    You'll have an integral to compute applying integration by parts.

    You can use too \cos^2u=\frac12(1+\cos2u)
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