What are the direction cosines of the vector

Given : A vector

To find : Direction cosines of the vector

Formula used : If a vector is l + m + n then direction cosines are given by , ,

Here l = 2 , m = 1 , n = -2

Direction cosines of the line with direction ratios 2, 1, -2 is

, ,

= , , = , ,

= , ,

Direction cosines of the vector is , ,