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Log[-c^2 + x^2]/2

Integrate[x/(-c^2 + x^2), x] ==
Log[-c^2 + x^2]/2 

             x
Integrate[--------, x] == 
            2    2
          -c  + x

      2    2
Log[-c  + x ]
-------------
      2
Time to compute: < 0.01 second
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