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

Integrate[Cos[3 + x]*Sin[1 + x], x] ==
-Cos[2*(2 + x)]/4 - (x*Sin[2])/2 

Integrate[Cos[3 + x] Sin[1 + x], x] == 

-Cos[2 (2 + x)]   x Sin[2]
--------------- - --------
       4             2
Time to compute: 0.02 second
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