$\"\"$

The function is $\"\"$ .

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

$\"\"$

Quotient Rule of differentiation: $\"\"$ .

$\"\"$

$\"\"$ .

$\"\"$

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

$\"\"$

The Zero of $\"\"$ corresponds to the point on the graph of the function where the tangent lines are horizontal.

$\"\"$

$\"\"$ .

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

$\"\"$ .

The Zero of $\"\"$ corresponds to the point on the graph of the function where the tangent lines are horizontal.