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Log[1 + Sin[a*x]]/a


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



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

Log[1 + Sin[a x]]
-----------------
        a

Time to compute: 0.01 second

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