$\"\"$

The vector $\"\"$ and $\"\"$ .

Dot product of $\"\"$ and $\"\"$ is $\"\"$ .

Let the vector $\"\"$ .

Substitute corresponding values in the dot product formula.

$\"\"$

Solve for $\"\"$ .

$\"\"$

Substitute a value for $\"\"$ and solve for $\"\"$ .

Let $\"\"$ , then $\"\"$ .

The vector $\"\"$ .

$\"\"$

The vector $\"\"$ .