$\"\"$

The function is $\"\"$ .

Rewrite the function.

$\"\"$

Take logarithm of each side.

$\"\"$

Product property of logarithms : $\"\"$ .

$\"\"$

Power property of logarithms : $\"\"$ .

$\"\"$

Property of logarithm : $\"\"$ .

$\"\"$ .

$\"\"$

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

$\"\"$

Substitue $\"\"$ in the aboveequation.

$\"\"$

$\"\"$ .