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(a^2 + x^2)^(3/2)/3

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

                  2    2
Integrate[x Sqrt[a  + x ], x] == 

  2    2 3/2
(a  + x )
------------
     3
Time to compute: < 0.01 second
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