u 2 v 4 − u 2 v 3 + u 2 v 2 − u 2 v − 2 u v 4 + 3 u v 3 − 3 u v 2 + 3 u v − 2 u − v 3 + v 2 − v + 1 u v 2 {\displaystyle {\frac {u^{2}v^{4}-u^{2}v^{3}+u^{2}v^{2}-u^{2}v-2uv^{4}+3uv^{3}-3uv^{2}+3uv-2u-v^{3}+v^{2}-v+1}{uv^{2}}}}
