Let `veca,vecb and vecc` be three unit vectors such that `vecaxx(vecbxxvecc)

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Let `veca,vecb and vecc` be three unit vectors such that `vecaxx(vecbxxvecc)=sqrt(3)/2(vecb+vecc)`. If `vecb` is not parallel to` vecc` then the angle between `veca and vecb` is (A) `(5pi)/6` (B) `(3pi)/4` (C) `pi/2` (D) `(2pi)/3`
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