l = m = n = 1 are the direction Cosines of

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

If l , m, n are the direction cosines of a line, then: a) l^(2)+m^(2)+n^(2)=1 b) l^(2)+m^(2)+n^(2)=0 c) l+m+n=1 d) l+m+n=0

If l_1, m_1, n_1 , and l_2, m_2, n_2 are the direction cosines of two mutually perpendicular lines, show that the direction cosines of the line perpendicular to both of these are m_1n_2-m_2n_1,n_1l_2-n_2l_1,l_1m_2-l_2m_1

If l_1, m_1, n_1 and l_2, m_2, n_2 are the direction cosines of two mutually perpendicular lines, show that the direction cosines of the line perpendicular to both of these are m_1n_2 - m_2n_1, n_1l_2 - n_2l_1, l_1m_2-l_2-m_1

If l_1, m_1, n_1 and l_2, m_2, n_2 are the direction cosines of two mutually perpendicular lines, show that the direction cosines of the line perpendicular to both of these are m_1n_2-m_2n_2, n_1l_2-n_2l_1, l_1m_2-l_2m_1

If (l_1, m_1, n_1), (l_2, m_2, n_2)" and "(l_3, m_3, n_3) are the direction cosines of three mutually perpendicular lines, prove that the line whose direction cosines are proportional to (l_1+l_2+l_3,m_1+m_2+m_3,n_1+n_2+n_3) makes equal angles with them,

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 the direction Cosines of a normal to a plane passing through the point (1,2,3) then the equation of the plane is

l=m=n=1 represent direction cosines of

If l,m,n are the direction cosines of a half line op then the maximum value of l.m.n is