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-1/(4*(4 + x^2)^2)

Integrate[x/(4 + x^2)^3, x] ==
-1/(4*(4 + x^2)^2) 

              x
Integrate[---------, x] == 
                2 3
          (4 + x )

    -1
-----------
        2 2
4 (4 + x )
Time to compute: < 0.01 second
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