$\"\"$

The function is $\"\"$ .

The two functions and its derivatives at $\"\"$ are $\"\"$ , $\"\"$ and $\"\"$ .

Find $\"\"$ .

$\"\"$ .

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

$\"\"$

Product rule of derivatives : $\"\"$ .

$\"\"$

Substitute $\"\"$ in the above equation.

$\"\"$

Substitute $\"\"$ , $\"\"$ and $\"\"$ in the above equation.

$\"\"$

$\"\"$ .

$\"\"$

$\"\"$ .