Question

the direction cosine x- axis is.

Answer 1

the direction cosines of line making an angle alpha with x - axis ........

Answer 2

Hence, the direction cosines are cos 0°, cos 90° and cos 90° i.e. 1, 0, 0. The dc's of a, y and z axis are (1,0,0), (0,1,0) and (0,0,1). The direction cosines of a line parallel to any coordinate axis are equal to the direction cosines of the corresponding axis.