If a line has direction ratios < a+b, b+c, c+a >,lt; a+b, b+c, c+a >, then what is the sum of the squares of its direction cosines? [NDA-I 2020]

NDA Math Three Dimensional Geometry

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If a line has direction ratios <a+b,b+c,c+a>, then what is the sum of the squares of its direction cosines?

[NDA-I 2020]

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