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(3*Sin[x] + Sin[3*x])/6


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



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

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

Time to compute: 0.01 second

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