$\"\"$

Find the limit for $\"\"$ .

$\"\"$

The limit of the natural logarithm of $\"\"$ when $\"\"$ approaches zero from the positive side $\"\"$ is minus infinity.

Therefore, $\"\"$ .

$\"\"$

Use the properties of inverse trigonometric function : $\"\"$ .

$\"\"$

Therefore, $\"\"$ .

$\"\"$

$\"\"$ .