$\"\"$

The expression is $\"\"$ .

For any real number b and for any power of negative integer n, $\"\"$ .

$\"\"$

$\"\"$ (Multiply numerator and denominator by $\"\"$ )

$\"\"$ (Apply Formula: $\"\"$ )

$\"\"$ (Evaluate power: $\"\"$ ) $\"\"$

The simplified expression is $\"\"$ .