$\"\"$

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Squeeze theorem :

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If $\"\"$ for all $\"\"$ in an open interval containing $\"\"$ , except possibly

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at $\"\"$ itself, and if $\"\"$ , then $\"\"$ exists and is equal to $\"\"$ .

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$\"\"$

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Given that $\"\"$ and $\"\"$ .

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Consider $\"\"$ .

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$\"\"$

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Multiply above expression by $\"\"$ .

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$\"\"$

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Apply limits as $\"\"$ .

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$\"\"$ .

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Substitute $\"\"$ in above expression.

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$\"\"$

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$\"\"$ .

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$\"\"$ . (From squeeze theorem)

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$\"\"$

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$\"\"$ .