The angle between two vectors `vec(A)` and `vec(B)` is `theta`. The resultant of these vectors `vec(R )` makes an angle of `theta//2` with `vec(A)`. which of the following is true?

Options

A. A=2B
B. `A=(B)/(2)`
C. A=B
D. AB=1

Answer

c

Explanation

`barR` is the angle bisectro
`therefore |barA|=|barA|`