u 2 v 4 − 3 u 2 v 3 + 4 u 2 v 2 − 4 u 2 v + 2 u 2 − 3 u v 4 + 8 u v 3 − 9 u v 2 + 8 u v − 3 u + 2 v 4 − 4 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}-4u^{2}v+2u^{2}-3uv^{4}+8uv^{3}-9uv^{2}+8uv-3u+2v^{4}-4v^{3}+4v^{2}-3v+1}{uv^{2}}}}
