( u − 1 ) ( v − 1 ) ( u 2 v 4 − 2 u 2 v 3 + u 2 v 2 − u v 4 + 3 u v 3 − 6 u v 2 + 3 u v − u + v 2 − 2 v + 1 ) u 3 / 2 v 5 / 2 {\displaystyle {\frac {(u-1)(v-1)\left(u^{2}v^{4}-2u^{2}v^{3}+u^{2}v^{2}-uv^{4}+3uv^{3}-6uv^{2}+3uv-u+v^{2}-2v+1\right)}{u^{3/2}v^{5/2}}}}
