A⁡(x)⁢pn⁡(x+ⅈ)-(A⁡(x)+C⁡(x))⁢pn⁡(x)+C⁡(x)⁢pn⁡(x-ⅈ)+2⁢n⁢sin⁡ϕ⁢pn⁡(x)=0,