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


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



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

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

Time to compute: 0.05 second

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