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(2*x*Cos[a*x])/a^2 + ((-2 + a^2*x^2)*Sin[a*x])/a^3

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

           2
Integrate[x  Cos[a x], x] == 

                      2  2
2 x Cos[a x]   (-2 + a  x ) Sin[a x]
------------ + ---------------------
      2                  3
     a                  a
Time to compute: 0.04 second
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