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