$\"\"$

\

The function $\"\"$

\

The expression is $\"\"$ .

\

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

\

$\"\"$

\

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

\

$\"\"$

\

Substitute $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Apply formula: $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .