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-(Log[Cos[c + (a + b)*x]]/(a + b))


Integrate[Sec[c + (a + b)*x]*Sin[c + a*x + b*x], x] ==
-(Log[Cos[c + (a + b)*x]]/(a + b))



Integrate[Sec[c + (a + b) x] Sin[c + a x + b x], 
 
   x] == 

  Log[Cos[c + (a + b) x]]
-(-----------------------)
           a + b

Time to compute: 0.11 second

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