$\"\"$

\

The function is $\"\"$ .

\

$\"\"$

\

$\"\"$

\

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

\

$\"\"$

\

Apply quotient rule of differentiation: $\"\"$ .

\

In this case $\"\"$ and $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .