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