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