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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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