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Math Help - integrate ln

  1. #1
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    integrate ln

     <br />
\int ln(y)dy<br />

    wondering how i would integrate this
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by jvignacio View Post
     <br />
\int ln(y)dy<br />

    wondering how i would integrate this
    This would be integrated by parts:

    Let u=\ln(y) and \,dv=\,dy

    See how far you can get with this

    --Chris
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  3. #3
    Junior Member toraj58's Avatar
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    Lightbulb

    u = \ln (x)
    dv = dx

    according to the formula of itegrating by parts:

    \color{blue}\boxed{\int udv = uv - \int vdu}

     = x\ln (x) - \int x(\frac {1}{x})dx
    x\ln (x) - x + c
    Last edited by toraj58; November 3rd 2008 at 10:43 PM.
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  4. #4
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    Quote Originally Posted by toraj58 View Post
    u = \ln (x)
    dv = dx

    according to the formula of itegrating by parts:

    \color{blue}\boxed{\int udv = uv - \int vdu}

     = x\ln (x) - \int x(\frac {1}{x})dx
    x\ln (x) - x + c
    thanks mate
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