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x - 2*Sqrt[2]*ArcTan[x/(2*Sqrt[2])]

Integrate[x^2/(8 + x^2), x] ==
x - 2*Sqrt[2]*ArcTan[x/(2*Sqrt[2])] 

             2
            x
Integrate[------, x] == 
               2
          8 + x

                         x
x - 2 Sqrt[2] ArcTan[---------]
                     2 Sqrt[2]
Time to compute: 0.05 second
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