$\"\"$

\

The expression is $\"\"$ .

\

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

\

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

\

$\"\"$ (Evaluate powers: $\"\"$ ) $\"\"$

\

For every number $\"\"$ , where b, c, d $\"\"$

\

$\"\"$ (Multiply by the reciprocal of $\"\"$ is $\"\"$ )

\

$\"\"$ (Product of two same signs is positive)

\

$\"\"$ (If $\"\"$ )

\

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

\

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

\

The quotient of $\"\"$ is $\"\"$ .