$\"\"$

\

Put x = 0 in the above limit .

\

$\"\"$

\

Apply L - Hopital rule .

\

$\"\"$

\

Now put x = 0 in the above limit

\

\

$\"\"$

\

Again apply L - Hopital rule

\

$\"\"$

\

Put x = 0 in the above limit

\

$\"\"$

\

Again apply L - Hopital rule

\

$\"\"$

\

Now put x = 0 in the above limit

\

$\"\"$

\

So the limit $\"\"$ .