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(Sqrt[Pi]*Erf[a + x])/(2*s^2)

Integrate[1/(E^(a + x)^2*s^2), x] ==
(Sqrt[Pi]*Erf[a + x])/(2*s^2) 

               1
Integrate[------------, x] == 
                  2
           (a + x)   2
          E         s

Sqrt[Pi] Erf[a + x]
-------------------
          2
       2 s
Time to compute: < 0.01 second
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