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Sinh[(m - n)*x]/(2*(m - n)) + Sinh[(m + n)*x]/(2*(m + n))

Integrate[Cosh[m*x]*Cosh[n*x], x] ==
Sinh[(m - n)*x]/(2*(m - n)) + Sinh[(m + n)*x]/ (2*(m + n)) 

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

Sinh[(m - n) x]   Sinh[(m + n) x]
--------------- + ---------------
   2 (m - n)         2 (m + n)
Time to compute: 0.12 second
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