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Tan[(a - b)*x]/(a - b)

Integrate[Sec[a*x - b*x]^2, x] ==
Tan[(a - b)*x]/(a - b) 

                        2
Integrate[Sec[a x - b x] , x] == 

Tan[(a - b) x]
--------------
    a - b
Time to compute: 0.02 second
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