f(x,y,z)=sin(xy)cos(yz)的二阶偏导数怎么求

f(x,y,z)=sin(xy)cos(yz)的二阶偏导数怎么求 f(x,y,z)=sin(xy)cos(yz)的二阶偏导数怎么求 设Z=sin(x+y)e的f（xy)次方,求əz/əx,əz/əy 求z=In(x²+y²)在点(0,-1)处的全微分 求函数z=sin(xy)+cos²(xy)的偏导数 Z=f(x,y)=y cos(3xy)的一阶偏导数要具体的过程,特别是第一步 求解微分方程xy'ln(x)sin(y)+cos(y)(1-x*cos(y))=0 z=ln sin(xy) 则 z'y=x cot(xy).判断这题对错. matlab 怎么算三重积分.方法多一种,加一倍分.例如 f = y*sin(x)+z*cos(x) z=sin(xy)+cos^2(xy)一阶偏导数 z=sin(xy)+cos^2(xy)一阶偏微分 z=f(x+y,xy,x/y),求z对于xy的二次导数 设z=f(x^2-y^2,e^（xy)),求偏导z/x,偏导z/y 设f(x+y,x-y)=xy,z=(xy,x/y),则dz= C语言求三角函数f(x,y,z)=sin(x)/(sin(x-y)*sin(x-z))+sin(y)/(sin(y-x)*sin(y-z))+sin(z)/(sin(z-x)*sin(z-y))代码#include #include double fun(double x,double y,double z){double a,b,c,sum;a=sin(x)/(sin(x-y)*sin(x-z));b=sin(y)/(sin(y-x)*sin(y-z));c matlaB函数问题t = -pi:0.01:pi;x=cos(t)-sin(3*t);y=sin(t)+cos(t);z=f(x,y)plot(t,z),grid on怎么不行呢 Z=x*sin xy+e^x+y或设y=(x)是由方程xy+sin x+sin y=1确定,求y” 已知z=z(x,y)由sin(xy)+z^2=sin(x+z)确定,求z关于x的偏导数 求z=f(x+y,xy)的二阶偏导数