$\"\"$

The function is $\"\"$ .

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

$\"\"$ .

$\"\"$

The function is $\"\"$ .

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

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

The function is $\"\"$ .

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

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

$\"\"$ .