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A line makes angles α, β, γ, δ with the four diagonals of a unit cube. 

sin2 α + sin2 β + sin2 γ + sin2 δ is

(a) 1/3

(b) 4/3

(c) 8/3

(d) 15/3

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Answer is (c) 8/3

sin2 α + sinβ + sin2 γ + sin2 δ

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