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ArcTanh[x/(3*Sqrt[2])]/(3*Sqrt[2])

Integrate[1/(18 - x^2), x] ==
ArcTanh[x/(3*Sqrt[2])]/(3*Sqrt[2]) 

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

            x
ArcTanh[---------]
        3 Sqrt[2]
------------------
    3 Sqrt[2]
Time to compute: 0.02 second
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