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


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



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

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

Time to compute: 0.02 second

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