u 2 v 4 − 3 u 2 v 3 + 4 u 2 v 2 − 3 u 2 v − 2 u v 4 + 6 u v 3 − 9 u v 2 + 6 u v − 2 u − 3 v 3 + 4 v 2 − 3 v + 1 u v 2 {\displaystyle {\frac {u^{2}v^{4}-3u^{2}v^{3}+4u^{2}v^{2}-3u^{2}v-2uv^{4}+6uv^{3}-9uv^{2}+6uv-2u-3v^{3}+4v^{2}-3v+1}{uv^{2}}}}
