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If vec a , vec b , vec c are unit vecto...

If ` vec a , vec b , vec c` are unit vectors such that ` vec adot vec b=0= vec adot vec c` and the angle between ` vec ba n d vec c` is `pi//3` , then the value of `| vec axx vec b- vec axx vec c|` is `1//2` b. `1` c. `2` d. none of these

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