If `h, m_1, n_1 and l_2, m_2, n_2 are D.C.s` of the two lines inclined to each other at an angle `theta`, then the D.C.'s of the internal and external bisectors of the angle between these lines are-

If h,m_(1),n_(1) and l_(2),m_(2),n_(2) areD.C.s of the two lines inclined to each other at an angle theta then the D.C.'s of the internal and external bisectors of the angle between these lines are-

If (l_(1),m_(1),n_(1)),(l_(2),m_(2),n_(2)) are direction cosines of two lines which inculude an angle 120^(@) , then the direction cosines of the line which bisects the angle between them is

If m_(1),m_(2) are the slopes of two lines and theta is the angle between two lines then tan theta =

If 'm_(1)',m_(2)' are the slopes of two lines and theta is the angle between two lines then tan theta=

If m_(1) , m_(2) are the slopes of two lines and theta is the angle between two lines then tan theta =

If l_1, m_1, n_2 ; l_2, m_2, n_2, be the direction cosines of two concurrent lines, then direction cosines of the line bisecting the angles between them are proportional to

If l_1,m_1,n_1 and l_2,m_2,n_2 are the direction cosines of two rays OA and OB making an angle theta then show that the direction cosines of the bisector of /_AOB are (l_1+l_2)/(2cos(theta/2)),(m_1+m_2)/(2cos(theta/2)),(n_1+n_2)/(2cos(theta/2))

The direction cosines of the lines bisecting the angle between the line whose direction cosines are l_1, m_1, n_1 and l_2, m_2, n_2 and the angle between these lines is theta , are