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Sqrt[a^2 + x^2]

Integrate[x/Sqrt[a^2 + x^2], x] ==
Sqrt[a^2 + x^2] 

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

      2    2
Sqrt[a  + x ]
Time to compute: < 0.01 second
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