Let \( P Q \) and \( Q R \) be diagonals of adjacent faces of a rectangular box, with its centre... VIDEO
Let \( P Q \) and \( Q R \) be diagonals of adjacent faces of a rectangular box, with its centre at \( O \). If \( \angle Q O R \), \( \angle R O P \) and \( \angle P O Q \) are \( \theta, \phi \) and \( \Psi \) respectively then the value of \( \cos \theta+\cos \phi+\cos \Psi \) is :https://bit.ly/YTAI_PWAP https://www.pw.live
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