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[" Let "vec a,vec b" and "vec c" be three unit vectors such that "vec a times(6timesvec c)=(sqrt(3))/(2)(vec b+vec c)*" if "vec b" is not parallel to "vec c" .What "],[" angle between "vec a" and "vec b" is: "],[[" (A) "(2 pi)/(3)," (B) "(5 pi)/(6)," (C) "(3 pi)/(4)," (D) "(pi)/(2)]]

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