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ArcSinh[(2*x)/3]/2


Integrate[1/Sqrt[9 + 4*x^2], x] ==
ArcSinh[(2*x)/3]/2



                1
Integrate[--------------, x] == 
                      2
          Sqrt[9 + 4 x ]

        2 x
ArcSinh[---]
         3
------------
     2

Time to compute: < 0.01 second

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