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