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If l1, m1, n2 ; l2, m2, n2, be the dire...

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

A

`1_(2),1_(2),m_(1)m_(2), n _(1)n_(2)`

B

`(1_(1))/(1_(2)), (m_(1))/(m_(2)), (n_(1))/(n_(2))`

C

`1_(1)+1_(2) ,m _(1) + m_(2),n_(1)+n_(2)`

D

`n_(1)n_(2)+m_(2)n_(1), n_(1) 1_(2) + n_(2) 1_(1), 1_(1)m_(2) +1_(2)m_(1)`

Text Solution

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The correct Answer is:
C
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VMC MODULES ENGLISH-THREE DIMENSIONAL GEOMETRY -LEVEL-1
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