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[" Let "a,b" and "8" be three unit vecto...

[" Let "a,b" and "8" be three unit vectors such that "],[a times(b times d)=(sqrt(3))/(2)(b+c)" .If "b" is not parallel to "c" ,then the "],[" angle between "a" and "b" is "],[[" (a) "(3 pi)/(4)," (b) "(pi)/(2)," (c) "(2 pi)/(3)," (d) "(5 pi)/(6)(20/6)]]

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