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

`+-(hati + hatj - 2hatk)/sqrt(6)`

`+-(hati + hatj - hatk)/sqrt(3)`

`+-(hati + hatj + hatk)/sqrt(3)`

`+-hatk`

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VMC MODULES ENGLISH-VECTORS -LEVEL -1

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