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


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



                3
               x
Integrate[-------------, x] == 
                2    2
          Sqrt[a  + x ]

     2    2        2    2
(-2 a  + x ) Sqrt[a  + x ]
--------------------------
            3

Time to compute: 0.02 second

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