1.

O is the centre, AB and AC are two diagonals of the adjacent faces of a rectangular box. If angles AOB, BOC and COA are θ,ϕ,Ψ respectively then cos θ+cosϕ+cosΨ is equal to

Answer»

O is the centre, AB and AC are two diagonals of the adjacent faces of a rectangular box. If angles AOB, BOC and COA are θ,ϕ,Ψ respectively then cos θ+cosϕ+cosΨ is equal to




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