z=sin(xy)+cos^2(xy)一阶偏导数_数学解答

z=sin(xy)+cos^2(xy)一阶偏导数

人气：248 ℃　时间：2020-04-10 20:59:38

解答

∂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)