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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 them are `m_(1)n_(2) - n_(1)m_(2), n_(1)l_(2) - l_(1)n_(2), l_(1)m_(2) - m_(1)l_(2)`

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ARIHANT PRAKASHAN-EXAMINATION PAPER 2019-Group-B
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