$[-/2$ Points$]$

Find the limit$.$

$(x,y)(5,4)e^{\underset{?}{lim}}{e}^{xy}$

$$

Discuss the continuity of the function.

continuous everywhere except where $xy>0$

continuous everywhere except where $xy=0$

continuous everywhere except $(0,0)$

continuous everywhere except where $xy<mn>0</mn>$

continuous everywhere

$5.[-/2$ Points$]$

Find both first partial derivatives.

$z=ln(\frac{x}{y})$

$\frac{\text{d}\text{e}\text{l}\text{z}}{z}=z$

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