The angle between two vectors A⃗ and B⃗ is θ. The resultant of these vectors R⃗ makes an angle of...

The angle between two vectors A⃗ and B⃗ is θ. The resultant of these vectors R⃗ makes an angle of θ / 2 with A. Which of the following is true?
(1) A=2 B
(2) A=B / 2
(3) A=B
(4) A B=1
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