z=arctan(y/x) x,y的偏导数

问题描述:

z=arctan(y/x) x,y的偏导数

楼上回答不对
z对x的偏导:-y/(x^2+y^2)
z对x的偏导:x^2/(x^2+y^2)

x,-y*x^(-2)/(1+(y/x)^2)
y,1/(x(1+(y/x)^2))