z=sin(xy)+cos^2(xy)一阶偏导数

分类: 作业答案 • 2022-01-02 16:16:12

问题描述：

答

∂Z/∂x= y*cos(xy) -2cos(xy)*sin(xy)*y
= y*cos(xy) - y*sin(2xy)
∂Z/∂y= x*cos(xy) -2cos(xy)*sin(xy)*x
= x*cos(xy) - x*sin(2xy)