− u v 3 w 3 + u v 3 w 2 + u v 2 w 3 − 2 u v 2 w 2 + u v 2 w + u v w 2 − v 2 w − v w 2 + 2 v w − v − w + 1 u v 3 / 2 w 3 / 2 {\displaystyle {\frac {-uv^{3}w^{3}+uv^{3}w^{2}+uv^{2}w^{3}-2uv^{2}w^{2}+uv^{2}w+uvw^{2}-v^{2}w-vw^{2}+2vw-v-w+1}{{\sqrt {u}}v^{3/2}w^{3/2}}}}
