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


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



                2 -3/2
Integrate[(4 + x )    , x] == 

      x
--------------
            2
4 Sqrt[4 + x ]

Time to compute: 0.01 second

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