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