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

Integrate[1/(x^2*Sqrt[a^2 - x^2]), x] ==
-(Sqrt[(a - x)*(a + x)]/(a^2*x)) 

                 1
Integrate[----------------, x] == 
           2       2    2
          x  Sqrt[a  - x ]

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