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\textbf{Partial Differentiation}

\textit{\textbf{Functions of more than one variable}}
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\textbf{Question}

Specify the domain of the function.

$$f(x,y) = \frac{xy}{x^2-y^2}$$


\textbf{Answer}

The domain consists of all points the do not lie on the lines $x=\pm
y$.

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