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**"Fairly" basic integral failing to become solved. O:-)**

Hi,

I'm having trouble with an integral where I simply do not know where to start. I just need a little nudge in the right direction. I've tried integration by parts and by substitution, but I'm really just stumbling in the dark and should obviously choose something in a more well-informed manner. If I could just get a nudge in the right direction I think that I can solve it. :)

## Homework Statement

[tex]\int (x^2+z^2)^{-3/2}dx[/tex]