$\"\"$

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The function is $\"\"$ .

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Squeeze theorem:

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if $\"\"$ for all $\"\"$ in an open interval containing $\"\"$ , except possibly at $\"\"$ itself, and if $\"\"$ , then $\"\"$ exists and is equal to $\"\"$ .

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Find $\"\"$ and $\"\"$ .

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Given $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$ is exists and $\"\"$ .

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$\"\"$ .

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$\"\"$

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$\"\"$ .