$\"\"$

\

The expression is $\"\"$ .

\

Evaluation of the limit .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

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

\

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

\

$\"\"$

\

$\"\"$

\

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

\

$\"\"$

\

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

\

$\"\"$

\

$\"\"$

\

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

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

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Therefore, $\"\"$ .

\

$\"\"$

\

$\"\"$ .