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