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Tan[(3*x)/2]/3

Integrate[1/(1 + Cos[3*x]), x] ==
Tan[(3*x)/2]/3 

               1
Integrate[------------, x] == 
          1 + Cos[3 x]

    3 x
Tan[---]
     2
--------
   3
Time to compute: 0.02 second
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