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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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