Q 2657145984.     lf `l_1, m_1 , n_1` and `I_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 I_2 - n_2 I_1,
I_1 m_2 -I_2 m_1`

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