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Sin[x]/2 + Sin[3*x]/6


Integrate[Cos[x]*Cos[2*x], x] ==
Sin[x]/2 + Sin[3*x]/6



Integrate[Cos[x] Cos[2 x], x] == 

Sin[x]   Sin[3 x]
------ + --------
  2         6

Time to compute: 0.09 second

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