A line makes angles α,β,γ and δ with the diagonals of a cube, prov – InterviewSolution

1.	A line makes angles α,β,γ and δ with the diagonals of a cube, prove the cos2α+cos2β+cos2γ+cos2δ=43
Answer» A line makes angles $α, β, γ$ and $δ$ with the diagonals of a cube, prove the $c o s^{2} α + c o s^{2} β + c o s^{2} γ + c o s^{2} δ = \frac{4}{3}$

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