If `l_1 , m_1 , n_1` aitd `l_2, m_2, n_2` are the direction cosines of two mutually perpendicular lines, show that th

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Q 1845567463.     If `l_1 , m_1 , n_1` aitd `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_1 n_2 - m_2 n_1 , n_1 l_2 - n_2 l_1`,
`l_1 m_2 - l_2 m_1`

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