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If l1,""""m1,""""n1 and l2,""""m2,"""...

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` .

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V PUBLICATION-THREE DIMENSIONAL GEOMETRY-QUESTION BANK
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  2. Show that the line joining the origin to the point (2, 1, 1)is perpen...

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