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