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-

0, 1/2, 1/√2 1, 1/2, √3/2 0, 1/5, √3/2 0, 1/2, 3/2

0, 1/2, 1/√2

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