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Log[c^4 + x^4]/4


Integrate[x^3/(c^4 + x^4), x] ==
Log[c^4 + x^4]/4



             3
            x
Integrate[-------, x] == 
           4    4
          c  + x

     4    4
Log[c  + x ]
------------
     4

Time to compute: < 0.01 second

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