If (1,-2,-2) and (0,2,1) are the d.r's of two lines then the d.r's of a line perpendicular to both the lines are "

The direction Cosines of two lines at right angles are l_(1),m_(1),n_(1)and l_(2),m_(2),n_(2) Then the direction cosines of a line which is perpendicular to both these lines are

If l_(1), m_(1), n_(1) and l_(2), m_(2), n_(2) are the direction cosines of two lines and l , m, n are the direction cosines of a line perpendicular to the given two lines, then

The direction cosines to two lines at right angles are (1,2,3) and (-2,1/2,1/3) then the direction cosine prependicular to both the given lines are

If the direction cosines of two lines are l_(1), m_(1), n_(1) and l_(2), m_(2), n_(2) , then find the direction cosine of a line perpendicular to these lines.

If two lines of regression are perpendicular, then the correlation coefficient r is

Equatin of the line passing through (-1, 1) and perpendicular to the line 2x +3y +4 =0 is

The equation of the line passing through the point (1,2) and perpendicular to the line x+y+1=0 is

If d_(1) , d_(2) ( d_(1) > d_(2) ) denote the lengths of the perpendiculars from the point (2,3) on the lines given by 15x^(2)+31xy+14y^(2)=0 , then d_(1)^(2) - d_(2)^(2) + (1)/(74) + (1)/(13) is equal to