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-(a*Sqrt[1 + x^2/a^2]) + x*ArcSinh[x/a]


Integrate[ArcSinh[x/a], x] ==
-(a*Sqrt[1 + x^2/a^2]) + x*ArcSinh[x/a]



                  x
Integrate[ArcSinh[-], x] == 
                  a

              2
             x                x
-(a Sqrt[1 + --]) + x ArcSinh[-]
              2               a
             a

Time to compute: 0.03 second

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