If the co-ordinates of the points P and Q are `(1,-2,1)and(2,3,4)` and O is the origin, then

The co-ordinates of two points P and Q are (x_1,y_1) and (x_2,y_2) and O is the origin. If circles be described on OP and OQ as diameters then length of their common chord is

The co-ordinates of two points P and Q are (2, 6) and (-3, 5) respectively. Find : the co-ordinates of the point where PQ intersects the x-axis.

If y_(1),y_(2) are the ordinates of two points P and Q on the parabola and y_(3) , is the ordinate of the point of intersection of tangents at P and Q, then

If y_(1),y_(2) are the ordinates of two points P and Q on the parabola and y_(3) is the ordinate of the point of intersection of tangents at P and Q then

If y_(1),y_(2) are the ordinates of two points P and Q on the parabola and y_(3) is the ordinate of the intersection of tangents at P and Q, then

If y_(1),y_(2) are the ordinates of two points P and Q on the parabola and y_(3) is the ordinate of the intersection of tangents at P and Q, then

If the co-ordinates of the point p are (1,2,2), what are the direction cosines of OP. (Here O is origin).