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-(x*Cot[x/2])


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



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

        x
-(x Cot[-])
        2

Time to compute: 0.03 second

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