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(x*Sqrt[1 + x^2] - ArcSinh[x])/4

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

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

            2
x Sqrt[1 + x ] - ArcSinh[x]
---------------------------
             4
Time to compute: 0.03 second
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