$\"\"$ \ \

The vectors are $\"\"$ and $\"\"$ .

The dot product of $\"\"$ and $\"\"$ is $\"\"$ .

$\"\"$

$\"\"$ . \ \

The vectors $\"\"$ and $\"\"$ are orthogonal if and only if $\"\"$ .

Since $\"\"$ , the vectors $\"\"$ and $\"\"$ are not orthogonal. $\"\"$

$\"\"$ , the vectors $\"\"$ and $\"\"$ are not orthogonal.