Question

Direction cosines of $Y$-axis are _______.

Answer 1

The angles made by the $Y$-axis with the coordinate axes are $\{{90}^{\circ },0^{\circ },{90}^{\circ }\}$

Hence, the direction cosines of the $Y$-axis are $\{\cos {90}^{\circ },\cos 0^{\circ },\cos {90}^{\circ }\}=\{0,1,0\}$