− u 2 v 4 + 3 u 2 v 3 − 3 u 2 v 2 + u 2 v + u v 4 − 3 u v 3 + 3 u v 2 − 3 u v + u + 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+uv^{4}-3uv^{3}+3uv^{2}-3uv+u+v^{3}-3v^{2}+3v-1}{uv^{2}}}}
