How do you show that a limit doesn't exist?(adsbygoogle = window.adsbygoogle || []).push({});

[itex]\lim_{x\to 0}cos(\frac{1}{x})[/itex]

This doesn't have any limit, since it will go from -1 to 1 when x goes towards 0, but how do I show that mathematically?

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# Non-existing limits

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