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-1/(2*n*(c^2 + x^2)^n)


Integrate[x*(c^2 + x^2)^(-1 - n), x] ==
-1/(2*n*(c^2 + x^2)^n)



              2    2 -1 - n
Integrate[x (c  + x )      , x] == 

      -1
--------------
      2    2 n
2 n (c  + x )

Time to compute: 0.01 second

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