If a line makes angles α, β, γ, δ with the four diagonals of a cube, then cos²α + cos²β + cos²γ + cos²δ equals:

If a line makes angles α, β, γ, δ with the four diagonals of a cube, then cos²α + cos²β + cos²γ + cos²δ equals:

• A. 4/3
• B. 3/4
• C. 1
• D. 2

Answer: A) 4/3

Explanation: Standard result in 3D geometry: If a line makes angles α, β, γ, δ with the four diagonals of a cube, the sum of their squared cosines is 4/3.