Question

Find the direction cosines of the line which bisects the angle between positive direction of Y and Z axis.

Answer 1

Vector parallel to bisector of angle between positive $Y$ & $Z$ direction

$=\hat{j}+\hat{k}$

Unit vestal $=\frac{\hat{i}}{\sqrt{2}}+\frac{\hat{k}}{\sqrt{2}}$

Direction conspires $(0,\frac{1}{\sqrt{2}},\frac{1}{\sqrt{2}})$