You can get this either by implicit differentiation and the product rule, or you could get this just by putting here, here,and here the partial derivatives of this with respect to x, y, and z.
可以通过隐函数微分法和乘法法则得到，或者直接,把关于x，y，z的偏微分放进来。
3
On the foundation we can summarize the keys of syndrome differentiation, the characteristic of therapeutic methods, and the rule of medication of director Xu.