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