u 2 v 3 − 4 u 2 v 2 + 2 u 2 v + u v 4 − 5 u v 3 + 7 u v 2 − 5 u v + u + 2 v 3 − 4 v 2 + v u v 2 {\displaystyle {\frac {u^{2}v^{3}-4u^{2}v^{2}+2u^{2}v+uv^{4}-5uv^{3}+7uv^{2}-5uv+u+2v^{3}-4v^{2}+v}{uv^{2}}}}
