# Let $z = f(x − y)$. Show that $\frac{\partial z}{\partial x}+\frac{\partial z}{\partial y}=0$

Let $z = f(x ? y)$. Show that $\frac{\partial z}{\partial x}+\frac{\partial z}{\partial y}=0$.

• Do you mean z=f(x,y)=x-y ?

• No, z=f(x-y). There is no typo.

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