Find the direction cosines of the straight line joining the points (4, -3, -1) and (1, -1, 5).

Find the direction cosines of the straight line joining the points : (2, -1, 4) and (0, 1, 5)

Find the direction cosines of the straight line joining the points : (4, 3, -5) and (-2, 1, -8)

Find the direction cosines of the line joining the points (-4,1,7),(2,-3,2)

Find the direction cosines of the lines joining the points: (-1,-1,-1) and (2,3,4)

Find the direction cosines of the line joining the two points P(-2, 4, -5) and Q(1, 2, 3). 6. Prove that the points (1, 2, 3), (3, 1, 7) and (7, -1, 15) are collinear.

(iii) Find the direction cosines of the line joining the points (2,4,3) and (1,-2,5)

The direction cosines of the line joining the points (-1, -1, -1) and (2, 3, 4) are,