`O` is the centre, `AB` and `BC` are two diagonals of the adjacent faces of a rectangular box. If angles `AOB, BOC` and

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Q 1287701687.     `O` is the centre, `AB` and `BC` are two diagonals of the adjacent faces of a rectangular box. If angles `AOB, BOC` and `COA` are `θ, ϕ` and `ψ` respectively, then `cos θ + cos ϕ + cos ψ` is equal to
A

`0`

B

`-1`

C

`1`

D

`1.5`

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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