$\"\"$

The expression is $\"\"$ .

$\"\"$ ( $\"\"$ can be written as $\"\"$ )

$\"\"$ (Product of two different signs is negative) $\"\"$

If $\"\"$ , where b,d $\"\"$ .

$\"\"$

$\"\"$ (Multiply numerator: $\"\"$ )

$\"\"$ (Multiply denominator: $\"\"$ ) $\"\"$

The product is $\"\"$ .