The function is $\"\"$ .

Rewrite the function.

$\"\"$

Apply derivative on each side with respect to $\"\"$ .

$\"\"$

$\"\"$ .

$\"\"$ when $\"\"$ .

$\"\"$ .

$\"\"$ for $\"\"$ .

From the I / D test, $\"\"$ for $\"\"$ .

$\"\"$ for $\"\"$ .

Hence $\"\"$ for $\"\"$ .

$\"\"$ for $\"\"$ .