Just an integral...

  1. Hi everyone! Could someone help me with evaluating the following integral?

    [itex]\int_{2 \pi /L}^{\pi/l_0} \int_{2 \pi /L}^{\pi/l_0} \frac{\cos(k_x \Delta x)}{k_x^2 + k_y^2} dk_x dk_y [/itex]

    I have a good reason to believe that it will end up with some
    [itex] \frac{1}{2} \ln (\frac{L}{\Delta x})[/itex]
    though this might just be some approximation of it, since
    [itex] l_0 \ll L, \Delta x \ll L[/itex] .
    Any help would be appreciated! Thank you!
     
  2. jcsd
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