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-Cot[3*x]^5/15


Integrate[Cot[3*x]^4*Csc[3*x]^2, x] ==
-Cot[3*x]^5/15



                  4         2
Integrate[Cot[3 x]  Csc[3 x] , x] == 

         5
-Cot[3 x]
----------
    15

Time to compute: 0.03 second

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