Let veca=hati + hatj +hatk,vecb=hati- ha...

Let `veca=hati + hatj +hatk,vecb=hati- hatj + hatk and vecc= hati-hatj - hatk` be three vectors. A vectors `vecv` in the plane of `veca and vecb` , whose projection on `vecc is 1/sqrt3` is given by

`hati -3hatj + 3hatk`

`-3hati - 3hatj- hatk`

`3hati -hatj + 3hatk`

`hati + 3hatj - 3hatk`

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