Direction Ratio of line along the bisector of two given lines

If the direction ratios of a line find the direction cosines of the line.

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

Direction ratio of the line segment joining two points

Direction cosine and ratio of line

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

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 l,m,n are direction cosines of the line then -l,-m,-n can be: a) only direction ratios of the line b) only direction cosines of the line c) direction cosines and direction ratios of the line d) neither direction cosines nor direction ratios of the line

Direction ratios of the line which is perpendicular to the lines with direction ratios (-1,2,2) and (0,2,1) are