− − u v 3 w + u v 3 + u v 2 w 3 − 3 u v 2 w 2 + 4 u v 2 w − 2 u v 2 − u v w 3 + 4 u v w 2 − 3 u v w + u v − v 2 w 3 + 3 v 2 w 2 − 4 v 2 w + v 2 + 2 v w 3 − 4 v w 2 + 3 v w − v − w 3 + w 2 u v 3 / 2 w 3 / 2 {\displaystyle -{\frac {-uv^{3}w+uv^{3}+uv^{2}w^{3}-3uv^{2}w^{2}+4uv^{2}w-2uv^{2}-uvw^{3}+4uvw^{2}-3uvw+uv-v^{2}w^{3}+3v^{2}w^{2}-4v^{2}w+v^{2}+2vw^{3}-4vw^{2}+3vw-v-w^{3}+w^{2}}{{\sqrt {u}}v^{3/2}w^{3/2}}}}
