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