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Log[Cos[3*x]]/9 + (x*Tan[3*x])/3


Integrate[x*Sec[3*x]^2, x] ==
Log[Cos[3*x]]/9 + (x*Tan[3*x])/3



                    2
Integrate[x Sec[3 x] , x] == 

Log[Cos[3 x]]   x Tan[3 x]
------------- + ----------
      9             3

Time to compute: 0.02 second

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