sin2⁡θ⁢(∂2⁡𝒦∂⁡θ2+((1-2⁢γ)⁢tan⁡θ+2⁢(δ+ϵ-12)⁢cot⁡θ)⁢∂⁡𝒦∂⁡θ-4⁢α⁢β⁢𝒦)+∂2⁡𝒦∂⁡ϕ2+((1-2⁢δ)⁢cot⁡ϕ-(1-2⁢ϵ)⁢tan⁡ϕ)⁢∂⁡𝒦∂⁡ϕ=0.