If \( f \) is an even function, prove that \( \operatorname{Lt}_{x \rightarrow 0^{-}} f(x)=\oper...

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If \( f \) is an even function, prove that \( \operatorname{Lt}_{x \rightarrow 0^{-}} f(x)=\operatorname{Lt}_{x \rightarrow 0^{+}} f(x) \).
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