t=x-2dt= dxx=-∞ , t->-∞x=+∞ , t->+∞∫(-∞->+∞) (x-2+2) e^[-(x-2)^2/2] dx=∫(-∞->+∞) (x-2) e^[-(x-2)^2/2] dx +2∫(-∞->+∞) e^[-(x-2)^2/2] dx=∫(-∞->+∞) t e^[-t^2/2] dt +2∫(-∞->+∞) e^[-t^2/2] dt
