− ( w − 1 ) ( 2 u v 2 w − u v 2 + 2 u v w 2 − 4 u v w + u v − 2 u w 2 + u w + v 2 w 2 − 2 v 2 w + v w 3 − 4 v w 2 + 2 v w − w 3 + 2 w 2 ) u v w 2 {\displaystyle -{\frac {(w-1)\left(2uv^{2}w-uv^{2}+2uvw^{2}-4uvw+uv-2uw^{2}+uw+v^{2}w^{2}-2v^{2}w+vw^{3}-4vw^{2}+2vw-w^{3}+2w^{2}\right)}{{\sqrt {u}}vw^{2}}}}
