Question

find directions cosine for r vector​

Answer 1

To find the direction cosines of the vector a is need to divided the corresponding coordinate of vector by the length of the vector. The coordinates of the unit vector is equal to its direction cosines. Property of direction cosines. The sum of the squares of the direction cosines is equal to one.

Answer 2

If the vector is (x,y,z)andr=|xy z| , the direction cosines are (xr,yr.zr) and the angles are (cos−1(xr),cos−1(yr),cos−1(zr)) .