设Z=x^2+siny,x=cost,y=t^3,则dz/dt=?

设Z=x^2+siny,x=cost,y=t^3,则dz/dt=? 设z=x^2siny-y^2cosx 求偏z/偏X z=x的平方+siny,x=cost,y=t的三次方则dz/dt为 设z=x^2-y^2,x=sint,y=cost,求dz/dt 求函数z=sinx+siny+sin(x+y)(0 设z=xyf(x+y,e^x siny),其中f具有一阶连续偏导数,求Zx,Zy 设z=xe^(x/y),x=cost,y=e^(2t) ,求全导数dz/dt． 设x+y=siny,求dy/dx 设函数f(u)具有二阶导数,而z=f((e^x)*sin(y))满足方程d^2(z)/d^2(x^2)+d^2(z)/d(y^2)=e^(2*x)*z,求f(u).令u=e^x*siny,则z=f(u)∂z/∂x=∂z/∂u*∂u/∂x=f'(u)*e^x*siny=uf'(u),∂²z/∂x²=∂(u 设siny+e^3x-2x^3y^2=0,求dy/dx 设y=x+siny,则[(d^2)y]/[dx^2]=? 求z=xy+(x^2)siny的二阶偏导数 u=f(x,y,z)=e^(x^2+y^2+z^2),而z=x^2siny.求du 设由x^2y-e^(2y)=siny确定y是x的函数,求dy/dx 证明sinx+siny+sinz-sin(x+y+z)=4sin((x+y)/2)sin((x+y)/2)sin((x+y)/2) 设Y=F（x）是由xy-x^3+siny-1/2=o确定,求y' 设xy-e^x=siny确定函数y=f(x),求y' 微分z=e^x-2y,x=cost,y=sint,求：dz/dt