$\"\"$

The function is $\"\"$ .

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

$\"\"$

Apply Product Rule of differentiation: $\"\"$ .

$\"\"$

$\"\"$ .

$\"\"$

Graph the functions $\"\"$ and $\"\"$ .

$\"\"$ .

Where the function has a zero slope the graph of its derivative touches the $\"\"$ -axis.

$\"\"$

$\"\"$ .

Graph the functions $\"\"$ and $\"\"$ .

$\"\"$ .

Where the function has a zero slope the graph of its derivative touches the $\"\"$ -axis.