4 b] If u=f\left( \frac{x}{y},\frac{y}{z},\frac{z}{x} \right) Show that x\frac{\partial u}{\partial x}+y\frac{\partial u}{\partial y}+z\frac{\partial u}{\partial z}=0
If u= f(x/y, y/z, z/x)
4 b] If u=f\left( \frac{x}{y},\frac{y}{z},\frac{z}{x} \right) Show that x\frac{\partial u}{\partial x}+y\frac{\partial u}{\partial y}+z\frac{\partial u}{\partial z}=0