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Let vec a , vec b"and" vec c be there u...

Let ` vec a , vec b"and" vec c` be there unit vectors such that ` vec axx( vec bxx vec c)=(sqrt(3))/2( vec b+ vec c)` . If ` vec b` is not parallel to ` vec c` , then the angle between ` vec a"and" vec b` is: (1) `(3pi)/4` (2) `pi/2` (3) `(2pi)/3` (4) `(5pi)/6`

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