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-Cos[3 + 2*x]/4 - Cos[3 + 4*x]/16 + (x*Sin[3])/4


Integrate[Cos[x]^2*Sin[3 + 2*x], x] ==
-Cos[3 + 2*x]/4 - Cos[3 + 4*x]/16 + (x*Sin[3])/4



                2
Integrate[Cos[x]  Sin[3 + 2 x], x] == 

-Cos[3 + 2 x]   Cos[3 + 4 x]   x Sin[3]
------------- - ------------ + --------
      4              16           4

Time to compute: 0.02 second

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