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(2*Log[Sin[(a*x)/2]])/a


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



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

          a x
2 Log[Sin[---]]
           2
---------------
       a

Time to compute: 0.01 second

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