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x/(a^2*Sqrt[a^2 + x^2])

Integrate[(a^2 + x^2)^(-3/2), x] ==
x/(a^2*Sqrt[a^2 + x^2]) 

            2    2 -3/2
Integrate[(a  + x )    , x] == 

       x
----------------
 2       2    2
a  Sqrt[a  + x ]
Time to compute: 0.02 second
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