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Q.

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→,OZ→respectively then the value of θ is

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a

π3

b

π6

c

π2

d

π4

answer is A.

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Detailed Solution

cosθ=12
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