$\"\"$

The expression is $\"\"$ .

The values of the variables are $\"\"$ and $\"\"$ .

$\"\"$ (Substitute $\"\"$ and $\"\"$ in the equation)

$\"\"$ (Simplify)

$\"\"$ (Divide the numerator and denominator by common factor $\"\"$ )

$\"\"$ (Simplify)

Therefore, the value of the expression $\"\"$ is $\"\"$ . $\"\"$

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