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If a, b, c be three units vectors such ...

If `a, b, c` be three units vectors such that ` a xx (b xx c)=(1/2) b ; b and c` being non-parallel then

A

the angle between a and c is `pi//3`

B

the angle between a and c is `pi//2`

C

the angle between a and b is `pi//3`

D

the angle between a and b is `pi//6`

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