If direction ratios of two lines are `2,-6,-3 and 4,3,-1` then direction ratios of a line perpendicular to them are

Direction ratios of the line are 2, 1, -3 . Find the direction cosines.

If (1,2,1), (1,-3,2) are the direction ratios of two lines and (l, m,n) are the direction cosines of a line perpendicular to the given lines, then l + m + n

If (2, 1, -1) and (1, -1, -1) are direction ratios of two lines, then the direction cosines of a line perpendicular to both the lines are

The direction ratios of a line are 2, 6 and -9. What are its direction cosines ?

If (1,-2,-2) and (0,2,1) are direction ratios of two lines, then direction cosines of a line perpendicular to both the lines are

If direction ratios of two lines are 5,-12,13 and -3,4,5 , then the angle between them is

If the direction ratios of a line are (-18,12,-4), then direction cosines of a line are