If \( \vec{a}, \vec{b} \) and \( \vec{c} \) are three mutually perpendicular unit vectors and \(... VIDEO
If \( \vec{a}, \vec{b} \) and \( \vec{c} \) are three mutually perpendicular unit vectors and \( \vec{d} \) is a unit vector which makes equal angle with \( \vec{a}, \vec{b} \) and \( \vec{c} \) then \( |\vec{a}+\vec{b}+\vec{c}+\vec{d}|^{2} \) is equal tohttps://bit.ly/YTAI_PWAP https://www.pw.live
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