$\"\"$

\

The expression is $\"\"$ .

\

$\"\"$

\

$\"\"$

\

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

\

$\"\"$

\

$\"\"$ (Apply formula: $\"\"$ )

\

$\"\"$ (Cancel common factors)

\

$\"\"$ (Simplify) $\"\"$

\

The simplified expression value is $\"\"$ .