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A complicated integral

  1. Mar 30, 2009 #1
    1. The problem statement, all variables and given/known data

    My answer should not be correct. Right?:uhh:
    Refer to the attachment please.

    2. Relevant equations

    Refer to the attachment please.

    3. The attempt at a solution

    Refer to the attachment please.

    Cheers
     

    Attached Files:

  2. jcsd
  3. Mar 30, 2009 #2
    Why not do a partial integration?

    x/sqrt[x^2+1] * x^2 dx

    You can integrate x/sqrt[x^2+1] this is proportional to
    sqrt[x^2+1]

    So, if you do a partial integration, you'll have to deal with the integral:

    x sqrt[x^2+1]

    where the x comes from the derivative of x^2. But this is then proportional to (x^2+1)^(3/2).
     
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