− 2 u v 2 w 2 − 2 u v 2 w − 2 u v w 2 + u v w − v w + 2 v + 2 w − 2 u v w {\displaystyle -{\frac {2uv^{2}w^{2}-2uv^{2}w-2uvw^{2}+uvw-vw+2v+2w-2}{{\sqrt {u}}vw}}}
