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