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(9*Sin[x] + Sin[3*x])/12

Integrate[Cos[x]^3, x] ==
(9*Sin[x] + Sin[3*x])/12 

                3
Integrate[Cos[x] , x] == 

9 Sin[x] + Sin[3 x]
-------------------
        12
Time to compute: < 0.01 second
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