u 2 v 4 − 4 u 2 v 3 + 6 u 2 v 2 − 5 u 2 v + 2 u 2 − 3 u v 4 + 7 u v 3 − 9 u v 2 + 7 u v − 3 u + 2 v 4 − 5 v 3 + 6 v 2 − 4 v + 1 u v 2 {\displaystyle {\frac {u^{2}v^{4}-4u^{2}v^{3}+6u^{2}v^{2}-5u^{2}v+2u^{2}-3uv^{4}+7uv^{3}-9uv^{2}+7uv-3u+2v^{4}-5v^{3}+6v^{2}-4v+1}{uv^{2}}}}
