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Homework Help: Bizarre integral!

  1. May 18, 2010 #1
    Now then, im close to shedding a tear with this one.

    This integral has been popping up in a few electromag examples iv been doing and i have absolutely no idea whats going on here.

    The integral is 1/[(x2+z2)3/2] with respect to x

    According to the textbook the answer is x/[z2(x2+z2)1/2]

    I initially, without evening really thinking, went straight for -1/(x[x2+z2]1/2)

    Any ideas?
    Thanks
     
  2. jcsd
  3. May 18, 2010 #2

    Cyosis

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    Homework Helper

    Use the substitution [itex]x=z \tan u[/itex].
     
  4. May 18, 2010 #3
    btw, you left a constant
     
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