356. Provide an example of a function that, when $x$ is equal to a known number, takes the form $\frac{0}{0}$, but as $x$ approaches this number, it tends to a certain limit,
356. Ex.: 1) $\frac{x^{2}-10 x+9}{x^{2}-9 x+8}$ as $x \rightarrow 1 ; \quad \frac{(x-1)(x-9)}{(x-1)(x-8)}=$ $=\frac{x-9}{x-8}$; as $x \rightarrow 1 \frac{x-9}{x-8} \rightarrow \frac{1-9}{1-8}=\frac{8}{7}$,

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\text { 2) } \frac{\tan x}{\cos x} \text { as } x \rightarrow 0
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