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x*ArcTan[x] - Log[1 + x^2]/2


Integrate[ArcTan[x], x] ==
x*ArcTan[x] - Log[1 + x^2]/2



Integrate[ArcTan[x], x] == 

                       2
              Log[1 + x ]
x ArcTan[x] - -----------
                   2

Time to compute: < 0.01 second

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