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


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



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

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

Time to compute: 0.01 second

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