− u v 2 w 4 + 2 u v 2 w 3 − 2 u v 2 w 2 + u v 2 w + u v w 4 − 2 u v w 3 + 3 u v w 2 − u v w + v w 3 − 3 v w 2 + 2 v w − v − w 3 + 2 w 2 − 2 w + 1 u v w 2 {\displaystyle {\frac {-uv^{2}w^{4}+2uv^{2}w^{3}-2uv^{2}w^{2}+uv^{2}w+uvw^{4}-2uvw^{3}+3uvw^{2}-uvw+vw^{3}-3vw^{2}+2vw-v-w^{3}+2w^{2}-2w+1}{{\sqrt {u}}vw^{2}}}}
