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