z=sin(xy)+cos(的平方)(xy) 求函数的偏导数,
问题描述:
z=sin(xy)+cos(的平方)(xy) 求函数的偏导数,
求z=sin(xy)+cos(的平方)(xy) 函数的偏导数
答
Zx=ycos(xy)-2ycos(xy)sin(xy)=ycos(xy)-ysin(2xy)
Zy=xcos(xy)-xsin(2xy)