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


Integrate[Cos[a*x]/(1 - Cos[a*x]), x] ==
(-2*x - (2*Cot[(a*x)/2])/a)/2



            Cos[a x]
Integrate[------------, x] == 
          1 - Cos[a x]

             a x
       2 Cot[---]
              2
-2 x - ----------
           a
-----------------
        2

Time to compute: 0.02 second

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