$\"\"$

\

The expression is $\"\"$ .

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Evaluation of the limit .

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$\"\"$

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$\"\"$

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$\"\"$

\

\

$\"\"$

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L $\"\"$ Hospital $\"\"$ s Rule :

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If the value of limit is indeterminate form of type $\"\"$ or $\"\"$ , then

\

$\"\"$

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$\"\"$

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Since $\"\"$ use L $\"\"$ Hospital $\"\"$ s rule.

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$\"\"$

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The product rule of derivative : $\"\"$ .

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$\"\"$

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$\"\"$

\

$\"\"$

\

\

$\"\"$

\

$\"\"$

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Since $\"\"$ use L $\"\"$ Hospital $\"\"$ s rule.

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Therefore $\"\"$

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$\"\"$

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$\"\"$ .