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ArcTan[(3*x)/2]/6


Integrate[1/(4 + 9*x^2), x] ==
ArcTan[(3*x)/2]/6



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

       3 x
ArcTan[---]
        2
-----------
     6

Time to compute: < 0.01 second

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