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Inconsistence in integral

  1. Feb 9, 2005 #1
    I am trying to do the integration

    [tex]\int_{0}^\infty \frac{x}{(x^2+c^2)^3} dx [/tex]

    At first I tried doing it with contour integration, but yielded zero. Later I figured out that it can actually be done simply by making a change in variable (squeezing the x in the numerator into the dx). Is it possible to do it with contour integration (though not necessary)?
    Last edited: Feb 9, 2005
  2. jcsd
  3. Feb 9, 2005 #2


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    Since it doesn't have real poles (thre denominator does not cancel in R),why didn't u try to do it only by the obvious substitution.I'm sure the result will not be awkward.

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