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-(3 + 6*x + 6*x^2 + 4*x^3)/(8*E^(2*x))


Integrate[x^3/E^(2*x), x] ==
-(3 + 6*x + 6*x^2 + 4*x^3)/(8*E^(2*x))



            3
           x
Integrate[----, x] == 
           2 x
          E

               2      3
-(3 + 6 x + 6 x  + 4 x )
------------------------
            2 x
         8 E

Time to compute: < 0.01 second

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