求全微分z=sin^2x cos^2yz=sin^2x +cos^2y

求全微分z=sin^2x cos^2yz=sin^2x +cos^2y 求全微分：z=(x-2y)^z 设Z=x^2lny-sin(xy),求全微分dz 4.二元隐函数z=z（x,y）由方程sec z+yz^2=1-x^3y确定,求全微分dz 22.已知二元隐函数z=z（x,y）由方程z^2+yz=1-xsiny确定,求全微分dz z=x^3y^2+x+y,求全微分 求全微分z=e^[sin(x+y)]*y^x Z=xy/根号x^2+y^2 求全微分 z=x^2-xy+y^3 求全微分dz 设函数Z=ln(x+y^2),则求全微分dz=?什么是全微分,怎么求全微分? 13．已知二元隐函数z=z（x,y）由方程sinz-yz^2=1-2xyz确定,求全微分dz 设z=f（yz,z-x）,求全微分dz 求全微分(x^2-2yz)dx+(y^2-2xz)dy+(z^2-2xy)dz的原函数 求全微分函数Z(X,Y),已知方程 Z^2*ln（X+Z)=XY 求全微分,z＝x^2e^y 求全微分 u=x^y^z z=sin(xy)+cos^2(xy)一阶偏微分 求全微分z=(x^2+y^2)/(x^2-y^2)