$\"\"$

\

Consider the vectors are $\"\"$ and $\"\"$ .

\

$\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

Consider the vectors are $\"\"$ and $\"\"$ .

\

$\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

Therefore, $\"\"$ .

\

$\"\"$

\

$\"\"$ .