$\"\"$

The expression is $\"\"$

$\"\"$ (Substitute: $\"\"$ ) $\"\"$

First find the value of $\"\"$

The radical $\"\"$ indicates positive square roots of 4.

$\"\"$ (Factorize: $\"\"$ )

$\"\"$ (Recall: $\"\"$ ) $\"\"$

Rewrite the expression

$\"\"$ (Substitute: $\"\"$ $\"\"$ )

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

The value of the expression is $\"\"$ .