Mathematics-I (3110014)

Q5 (c) Winter-2019   If $\mathrm{u}=\mathrm{f}\left(\mathrm{x}-\mathrm{y}, \mathrm{y}-\mathrm{z}, \mathrm{z}-\mathrm{x}\right)$ then show that $\frac{\partial u}{\partial x}+\frac{\partial u}{\partial y}+\frac{\partial u}{\partial z}=0$.