∂ ( C x N ) ∂ x + ∂ ( C y N ) ∂ y + ∂ ( C θ N ) ∂ θ = κ 2 σ [ ( C C g cos 2 θ N y ) y − C C g 2 cos 2 θ N y y ] + S i n + S d p + S n l {\displaystyle {\frac {\partial \left({C_{x}N}\right)}{\partial x}}+{\frac {\partial \left({C_{y}N}\right)}{\partial y}}+{\frac {\partial \left({C_{\theta }N}\right)}{\partial \theta }}={\frac {\kappa }{2\sigma }}\left[{\left({CC_{g}\cos ^{2}\theta N_{y}}\right)_{y}-{\frac {CC_{g}}{2}}\cos ^{2}\theta N_{yy}}\right]+S_{in}+S_{dp}+S_{nl}}
![{\displaystyle {\frac {\partial \left({C_{x}N}\right)}{\partial x}}+{\frac {\partial \left({C_{y}N}\right)}{\partial y}}+{\frac {\partial \left({C_{\theta }N}\right)}{\partial \theta }}={\frac {\kappa }{2\sigma }}\left[{\left({CC_{g}\cos ^{2}\theta N_{y}}\right)_{y}-{\frac {CC_{g}}{2}}\cos ^{2}\theta N_{yy}}\right]+S_{in}+S_{dp}+S_{nl}}](https://en.wikipedia.org/api/rest_v1/media/math/render/svg/975bedc9590bbe2846874522143f0b0e406098d1)