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


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



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

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

Time to compute: 0.02 second

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