If a line makes angle 90°, 60° and 45°with the positive direction of X, Y and Z-axis respectively, then it's direction cosines will be-
Answer & explanation
Correct answer: option 1
Let the direction cosines of the lines be l, m, n. Then l= cos(90°)= 0 , m= cos(60°)= 1/2, n = cos(45°) = 1/√2