$\"\"$

\

The function is $\"\"$ .

\

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

\

$\"\"$

\

Differentiate $\"\"$ partially with respect $\"\"$ .

\

$\"\"$

\

Differentiate $\"\"$ partially with respect $\"\"$ .

\

$\"\"$

\

$\"\"$

\

The function is $\"\"$ .

\

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

\

$\"\"$

\

Differentiate $\"\"$ partially with respect $\"\"$ .

\

$\"\"$

\

Differentiate $\"\"$ partially with respect $\"\"$ .

\

$\"\"$

\

Thus, $\"\"$ .

\

$\"\"$

\

. $\"\"$ .

\

$\"\"$ .

\

$\"\"$ .