In analytic geometry, the direction cosines of a vector are the cosines of the angles between the vector and the three positive coordinate axes. Equivalently, they are the contributions of each component of the basis to a unit vector in that direction.

What is meaning of direction cosine?

: any of the cosines of the three angles between a directed line in space and the positive direction of the axes of a rectangular Cartesian coordinate system —usually used in plural.

How do you find direction cosine?

Direction cosines:

Let the position vector make positive angle (anticlockwise direction) of α , β and γ with the positive x , y and z axis respectively. These angles are known as direction angles and on taking the cosine of these angles we get direction cosines.