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