Q 2210578419.     Let `vec(a)` and `vec(b)` are two vectors making angles `theta` with each

other, then unit vectors along bisector of `vec(a)` and `vec(b)` is

A

`pm (hat (a) + hat (b) )/2`

B

`pm (hat (a) + hat (b) )/(2 cos theta )`

C

`pm (hat (a) + hat (b) )/(2 cos theta /2) `

D

`pm (hat (a) + hat (b) )/(| hat(a) + hat(b) |)`

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