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Let the vectors vec and vec b be such th...

Let the vectors `vec and vec b` be such that `|vec a|= 3 and |vec b|= sqrt2/3`, then`vec a xx vec b` is a unit vector if the angle between `vec a and vec b` is

A

`pi/6`

B

`pi/4`

C

`pi/3`

D

`pi/2`

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