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(Cos[a*x] + a*x*Sin[a*x])/a^2


Integrate[x*Cos[a*x], x] ==
(Cos[a*x] + a*x*Sin[a*x])/a^2



Integrate[x Cos[a x], x] == 

Cos[a x] + a x Sin[a x]
-----------------------
           2
          a

Time to compute: < 0.01 second

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