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