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

What is the sum of the squares of direction cosines of the line joining the points (1,2,-3) and (-2,3,1) ?

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

What is the sum of the squares of direction cosines of the line joining the points (1,2,-3) and (-2,3,1)?

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

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

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

(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 (-2, 4, -5) and (1, 2, 3) is :

(4) Find the direction cosines of the line joining the points (2,3,4) and (4,5,6).