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((x^n*Gamma[1 + n, -x])/(-x)^n - Gamma[1 + n, x])/2


Integrate[x^n*Cosh[x], x] ==
((x^n*Gamma[1 + n, -x])/(-x)^n - Gamma[1 + n, x])/2



           n
Integrate[x  Cosh[x], x] == 

 n
x  Gamma[1 + n, -x]
------------------- - Gamma[1 + n, x]
           n
       (-x)
-------------------------------------
                  2

Time to compute: 0.04 second

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