1.

A vector vec(a)=alpha hati+2hatj+beta hatk(alpha, beta in R) lies in the plane of the vectors, vec(b)=hati+hatj and vec( c )=hati-hatj+4hatk. If vec(a) bisects the angle between vec(b) and vec( c ), then

Answer»

`VEC(a)*hati+2=0`
`vec(a)*hatk+2=0`
`vec(a)*hati+1=0`
NONE of these

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