− 2 u 2 v 4 − 7 u 2 v 3 + 9 u 2 v 2 − 5 u 2 v + u 2 − 3 u v 4 + 12 u v 3 − 17 u v 2 + 12 u v − 3 u + v 4 − 5 v 3 + 9 v 2 − 7 v + 2 u v 2 {\displaystyle -{\frac {2u^{2}v^{4}-7u^{2}v^{3}+9u^{2}v^{2}-5u^{2}v+u^{2}-3uv^{4}+12uv^{3}-17uv^{2}+12uv-3u+v^{4}-5v^{3}+9v^{2}-7v+2}{uv^{2}}}}
