$\"\"$

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

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

If two vectors $\"\"$ and $\"\"$ are orthogonal to each other, then their dot product $\"\"$ is equal to zero.

Find $\"\"$ .

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

$\"\"$

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

$\"\"$

$\"\"$ ; $\"\"$ and $\"\"$ are not orthogonal.