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(E^(2*x) - ArcTan[E^(2*x)])/2


Integrate[E^(6*x)/(1 + E^(4*x)), x] ==
(E^(2*x) - ArcTan[E^(2*x)])/2



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

 2 x           2 x
E    - ArcTan[E   ]
-------------------
         2

Time to compute: 0.01 second

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