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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
b
π6
c
π2
d
π4

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detailed solution

Correct option is A

cosθ=12


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