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(Cos[3*x] + 3*x*Sin[3*x])/9

Integrate[x*Cos[3*x], x] ==
(Cos[3*x] + 3*x*Sin[3*x])/9 

Integrate[x Cos[3 x], x] == 

Cos[3 x] + 3 x Sin[3 x]
-----------------------
           9
Time to compute: 0.01 second
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