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(9*Sin[x/3] + Sin[x])/4


Integrate[Cos[x/3]^3, x] ==
(9*Sin[x/3] + Sin[x])/4



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

      x
9 Sin[-] + Sin[x]
      3
-----------------
        4

Time to compute: < 0.01 second

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