− ( w − 1 ) ( 2 u v 2 w 2 − u v 2 w − 2 u v w 2 + 2 u v w − u v − 2 u w + u + v 2 w 3 − 2 v 2 w 2 − v w 3 + 2 v w 2 − 2 v w − w 2 + 2 w ) u v w 2 {\displaystyle -{\frac {(w-1)\left(2uv^{2}w^{2}-uv^{2}w-2uvw^{2}+2uvw-uv-2uw+u+v^{2}w^{3}-2v^{2}w^{2}-vw^{3}+2vw^{2}-2vw-w^{2}+2w\right)}{{\sqrt {u}}vw^{2}}}}
