If cos α, cos β, cos γ are the direction cosines of a vector a^{\to} , then cos 2α + cos 2β + cos 2γ is equal to

KCET 2016 Math Solved Paper

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If cos α, cos β, cos γ are the direction cosines of a vector

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, then cos 2α + cos 2β + cos 2γ is equal to

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