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

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

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

       2    2      2    2
Sqrt[-a  + x ] (2 a  + x )
--------------------------
            3
Time to compute: 0.02 second
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