$\"\"$

The limit expression is $\"\"$ .

$\"\"$

Apply quotient property of limits: $\"\"$ , if $\"\"$ .

$\"\"$

Apply sum and difference property of limits: $\"\"$ .

$\"\"$

Apply power property of limits: $\"\"$ .

$\"\"$

$\"\"$ .

Therefore, $\"\"$ .

$\"\"$

$\"\"$ .