${\left|\overline{u}\right|}^2=\_\_\_\_\_\_$

The mangnitude of P $\left(3,4,5\right)$ is $\_\_\_\_\_\_$

The $\_\_\_\_\_\_$ vector represents a unit in the direction of x-axis.

If $\overline{a} =\left(1,2,1\right)$ and $\overline{b} =\left(1,0,2\right)$ then $\left|\overline{a} - \overline{b}\right|=\_\_\_\_\_\_$

If $\overline{a} =3i+2j-k$ , then the direction cosine of $\overline{a}$ corresponding to x-axis is $\_\_\_\_\_\_$

The angle between the vectors $\overline{a} =\left(1,3,-2\right)$ and  $\overline{b} =\left(4,-2,-1\right)$ is $\_\_\_\_\_\_$

If $\overline{x}=\left(2,1\right)$ and $\overline{y}=\left(1,3\right)$ then unit vector in the direction of $3\overline{x} - 2\overline{y}$ is given by $\_\_\_\_\_\_$

If $\overline{a} =\left(2,-3,-1\right)$ and $\overline{b} =\left(1,4,-3\right)$ then their cross product $=\_\_\_\_\_\_$

If $\overline{x} =\left(1,2,3\right)$ and $\overline{y} =\left(2,3,4\right)$ then their dot product $=\_\_\_\_\_\_$

$\_\_\_\_\_\_$ is a unit vector.