$\"\"$

\

The expression is $\"\"$ .

\

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

\

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

\

$\"\"$ (Simplify)

\

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

\

The expression $\"\"$ is $\"\"$ .