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ArcTan[(1 + x)^3]/3


Integrate[(1 + 2*x + x^2)/(1 + (1 + x)^6), x] ==
ArcTan[(1 + x)^3]/3



                     2
          1 + 2 x + x
Integrate[------------, x] == 
                     6
          1 + (1 + x)

              3
ArcTan[(1 + x) ]
----------------
       3

Time to compute: 0.01 second

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