$\"\"$

The integral is $\"\"$ .

Multiply and divide by $\"\"$ .

$\"\"$

Let $\"\"$ .

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

$\"\"$

$\"\"$ .

$\"\"$

\ \ \ \ \ \ \ \ \ \ \ \ \ \

$\"\"$	$\"\"$	$\"\"$
$\"\"$	$\"\"$	$\"\"$