cem⁡(x,h2)cem⁡(0,h2)=2m-(1/2)σm⁢(Wm+⁡(x)⁢(Pm⁡(x)-Qm⁡(x))+Wm-⁡(x)⁢(Pm⁡(x)+Qm⁡(x))),