Find: \(\displaystyle\lim_{{{t}\to\infty}}{\left[{e}^{{-{t}}}{\int_{{0}}^{{t}}}{\int_{{0}}^{{t}}}{\frac{{{e}^{{x}}-{e}^{{y}}}}{{{x}-{y}}}}{\left.{d}{x}\right.}{\left.{d}{y}\right.}\right]}\)

Find the local maximum and minimum values and saddle points of the function. If you have three-dimensional graphing software, graph the function with a domain and viewpoint that reveal all the important aspects of the function
$f(x,y)=x^3-6xy+8y^3$

$\frac{1}{\sec <!--\; \; -->(x)}$ in derivative?

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