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(2*(-2*a + b*x)*Sqrt[a + b*x])/(3*b^2)

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

                x
Integrate[-------------, x] == 
          Sqrt[a + b x]

2 (-2 a + b x) Sqrt[a + b x]
----------------------------
               2
            3 b
Time to compute: 0.02 second
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