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