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-ArcTanh[x^2]/2

Integrate[x/(-1 + x^4), x] ==
-ArcTanh[x^2]/2 

             x
Integrate[-------, x] == 
                4
          -1 + x

          2
-ArcTanh[x ]
------------
     2
Time to compute: < 0.01 second
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