− u 2 v 4 − 3 u 2 v 3 + 3 u 2 v 2 − u 2 v + 3 u v 3 − 5 u v 2 + 3 u v − v 3 + 3 v 2 − 3 v + 1 u v 2 {\displaystyle -{\frac {u^{2}v^{4}-3u^{2}v^{3}+3u^{2}v^{2}-u^{2}v+3uv^{3}-5uv^{2}+3uv-v^{3}+3v^{2}-3v+1}{uv^{2}}}}
