$\"\"$

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The function $\"\"$ .

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The expression is $\"\"$ .

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Divide each side by $\"\"$ , $\"\"$ .

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$\"\"$

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Apply limit on each side as $\"\"$ .

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$\"\"$

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Substitute $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Apply formula: $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .