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If |veca|=4,|vecb|=2 sqrt3 and |vecaxxve...

If `|veca|=4,|vecb|=2 sqrt3` and `|vecaxxvecb|=12` then the angle between the vectors `veca` and `vecb` is

A

`pi/3`

B

`pi/6`

C

`pi/4`

D

`pi/2`

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