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