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