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vec ba n d vec c are unit vectors. Then...

` vec ba n d vec c` are unit vectors. Then for any arbitrary vector ` vec a ,((( vec axx vec b)+( vec axx vec c))xx( vec bxx vec c))dot( vec b- vec c)` is always equal to a.`| vec a|` b. `1/2| vec a|` c. `1/3| vec a|` d. none of these

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