$\"\"$

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

Angle between two vectors :

If $\"\"$ is the angle between two vectors u and v, then $\"\"$ .

Find $\"\"$ .

$\"\"$

Substitute the values $\"\"$ , $\"\"$ and $\"\"$ in $\"\"$ .

$\"\"$

If $\"\"$ , then the vectors are orthogonal to each other.

$\"\"$

The vectors u and v are orthogonal vectors.