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Let vecaxx(vecbxxvecc)=vecb/2 and vecb, ...

Let `vecaxx(vecbxxvecc)=vecb/2` and `vecb, vecc` are non parallel unit vectors. If angle between `veca` and `vecb` is `alpha` and angle between `veca` and `vecc` is `beta` then `|alpha-beta|` is equal to (A) `pi/2` (B) `pi/6` (C) `pi/3` (D) `pi/4`

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