Let veca=hati-hatj, vecb=hatj-hatk, vecc...

Let `veca=hati-hatj, vecb=hatj-hatk, vecc=hatk-hati. If hatd` is a unit vector such that `veca.hatd=0=[vecb, vecc, vecd] then hatd` equals (A) `+-(hati+hatj-2hatk)/sqrt(6)` (B) `+-(hati+hatj-hatk)/sqrt(3)` (C) `+-(hati+hatj+hatk)/sqrt(3)` (D) `+-hatk`

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