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-Sqrt[(a - x)*(a + x)]


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



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

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

Time to compute: < 0.01 second

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