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(x*(18 + 3*a*x + 2*b*x^2))/6


Integrate[3 + a*x + b*x^2, x] ==
(x*(18 + 3*a*x + 2*b*x^2))/6



                       2
Integrate[3 + a x + b x , x] == 

                     2
x (18 + 3 a x + 2 b x )
-----------------------
           6

Time to compute: < 0.01 second

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