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(-2*Cot[2*a*x])/a

Integrate[Csc[a*x]^2*Sec[a*x]^2, x] ==
(-2*Cot[2*a*x])/a 

                  2         2
Integrate[Csc[a x]  Sec[a x] , x] == 

-2 Cot[2 a x]
-------------
      a
Time to compute: 0.01 second
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