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Log[Cos[a*x]]/a + Sec[a*x]^2/(2*a)


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



                  3
Integrate[Tan[a x] , x] == 

                        2
Log[Cos[a x]]   Sec[a x]
------------- + ---------
      a            2 a

Time to compute: 0.01 second

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