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31-01-2024
Mathematics

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If l₁, m₁, n₁ and l₂, m₂, n₂ are the direction cosines of two lines, then show that the direction cosines of the line perpendicular to them are proportional to m₁n₂ - m₂n₁, n₁l₂ - n₂l₁, l₁m₂ - l₂m₁.

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