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