If ` l_1, m_1, n_1` and `l_2, m_2, n_2` be the direction cosines of two concurrent lines. Then the direction cosines

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Q 1207134088.     If ` l_1, m_1, n_1` and `l_2, m_2, n_2` be the direction cosines of two concurrent lines. Then the direction cosines of the line bisecting the angles between them are proportional to
A

`l_1 + l_2, m_1 + m_2, n_1 + n_2`

B

`l_1 l_2, m_1 m_2, n_1 n_2`

C

`l_1 - l_2, m_1 - m_2, n_1 - n_2`

D

`m_1 n_2 + m_2 n_1, n_1 l_1 + n_2 l_2 , l_1 m_2 + l_2 m_1`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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