− u 2 v 4 − 4 u 2 v 3 + 7 u 2 v 2 − 6 u 2 v + 2 u 2 − 3 u v 4 + 11 u v 3 − 17 u v 2 + 11 u v − 3 u + 2 v 4 − 6 v 3 + 7 v 2 − 4 v + 1 u v 2 {\displaystyle -{\frac {u^{2}v^{4}-4u^{2}v^{3}+7u^{2}v^{2}-6u^{2}v+2u^{2}-3uv^{4}+11uv^{3}-17uv^{2}+11uv-3u+2v^{4}-6v^{3}+7v^{2}-4v+1}{uv^{2}}}}
