Evaluate the common limit I have to assess some limits without using L'Hopital rule, just by definition. So I got: lim_(h->0)((e^h-1)/h). After evaluating it in a Math app, it states that it's just 1 due to the common limit evaluation, but I don't understand why it's 1.

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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