$\"\"$

The matrices are $\"\"$ .

If $\"\"$ and $\"\"$ are inverse matrices, then $\"\"$ .

Find $\"\"$ .

$\"\"$

Find $\"\"$ .

$\"\"$

$\"\"$ and $\"\"$ .

Thus, $\"\"$ .

Therefore $\"\"$ and $\"\"$ are not inverses.

$\"\"$

$\"\"$ and $\"\"$ are not inverses.