$\"\"$

The function is $\"\"$ .

Find the first partial derivatives $\"\"$ .

$\"\"$ .

Differentiate partially with respect to $\"\"$ treating $\"\"$ as constant.

$\"\"$

$\"\"$ .

$\"\"$

Find the first partial derivatives $\"\"$ .

$\"\"$ .

Differentiate partially with respect to $\"\"$ treating $\"\"$ as constant.

$\"\"$

$\"\"$ .

$\"\"$

First partial derivatives are $\"\"$ and $\"\"$ .