$\"\"$

\

The limit expression is $\"\"$ .

\

The maclaurin series of $\"\"$ is $\"\"$ , $\"\"$ .

\

Substitute $\"\"$ in $\"\"$ . $\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .