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-((x*Cot[a*x])/a) + Log[Sin[a*x]]/a^2

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

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

  x Cot[a x]    Log[Sin[a x]]
-(----------) + -------------
      a               2
                     a
Time to compute: 0.02 second
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