Let P Q and Q R be diagonals of adjacent faces of a rectangular box, with its centre at O. if \angle {QOR}, \angle {ROP} and \angle {POQ} are \theta, \phi and \psi respectively then the value of { }^{'} \cos \theta+\cos \phi+\cos \psi^{'} is

JEE Advanced 2020 Full Test 1 Paper 2

Question : 41 of 54

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Let PQ and QR be diagonals of adjacent faces of a rectangular box, with its centre at O. if ∠QOR,∠ROP and ∠POQ are θ,φ and ψ respectively then the value of ‌′‌cos‌θ+cos‌φ+cos‌ψ′ is

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