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Thread: Integral help please

  1. February 17th 2009, 02:27 PM #1
    pianopiano
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    Integral help please

    Integral of sqrt(x+1) * sin[sqrt(x+1)] dx

    Integration by parts doesn't seem to make the integral any more simple. Any thoughts?
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  2. February 17th 2009, 03:00 PM #2
    skeeter
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    \int \sqrt{x+1} \sin(\sqrt{x+1}) \, dx

    t = \sqrt{x+1}

    dt = \frac{dx}{2\sqrt{x+1}}

    dx = 2t \, dt

    \int 2t^2 \sin{t} \, dt

    now do parts.
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  3. February 17th 2009, 03:03 PM #3
    Kaitosan
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    Edit: nvm
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