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