Find a unit vector in the direction of vector `vecA=(hati-2hatj+hatk)`

Explanation

`hatn=(vecA)/(|vecA|)`
`|vecA|=sqrt((1)^(2)+(-2)^(2)+(1)^(2))=sqrt(1+4+1)=sqrt(6)`
`:.hatn=(1)/(sqrt(6)(hati-2hatj+hatk)`
Hint. `hatn=(vecA)/(|vecA|)`