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