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


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



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

                2    2
        x Sqrt[a  - x ]
-ArcTan[---------------]
             2    2
           -a  + x

Time to compute: 0.01 second

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