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ArcTanh[x/c]/c

Integrate[1/(c^2 - x^2), x] ==
ArcTanh[x/c]/c 

             1
Integrate[-------, x] == 
           2    2
          c  - x

        x
ArcTanh[-]
        c
----------
    c
Time to compute: < 0.01 second
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