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If  θ is an angle given by cosθ=cos2α+cos2β+cos2γsin2α+sin2β+sin2γ where α,β,γ are the angles made by a line with the axes OX,OY,OZrespectively then the value of θ is

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a
π3
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π6
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π2
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π4

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detailed solution

Correct option is A

cosθ=12

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