− ( w − 1 ) ( u v w 2 + u w 4 + u w 3 − u w 2 − v w 2 + v w + v + w 2 ) u v w 5 / 2 {\displaystyle -{\frac {(w-1)\left(uvw^{2}+uw^{4}+uw^{3}-uw^{2}-vw^{2}+vw+v+w^{2}\right)}{{\sqrt {u}}{\sqrt {v}}w^{5/2}}}}
