设由方程sin(x-2y+3x)=x-2y-3z确定的函数z=z(x,y),求∂z/∂x,,∂z/∂y.
设F(x,y,z)=sin(x-2y+3z)-x+2y+3z,F′x=cos(x-2y+3z)-1,F′y=cos(x-2y+3z)(-2)+2,F′z=cos(x-2y+3z)•3+3,所以∂z/∂x=-(F′x/F′z)=[cos(x-2y+3z)-1]/[3cos(x-2y+3z)+3]=[1-cos(x-2y+3z)]/[3cos(x-2y+3z)+3],∂z/∂y=-(F′y/F′z)=[-2cos(x-2y+3z)+1]/[3cos(x-2y+3z)+3]=[2cos(x-2y+3z)-2]/[3cos(x-2y+3z)+3]