$\"\"$

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The limit is $\"\"$ .

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Consider $\"\"$ .

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Therefore, $\"\"$ .

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If $\"\"$ , then $\"\"$ .

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Substitue $\"\"$ and $\"\"$ in the limit.

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$\"\"$

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$\"\"$

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Limit property : $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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Assume $\"\"$ .

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If $\"\"$ , then $\"\"$ .

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Substitue $\"\"$ and $\"\"$ in the limit.

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$\"\"$ .

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Definition of the number $\"\"$ : $\"\"$ is a number such that $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .