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Choose the correct answer from the bracket.The angle between the vectors `veca and vecb` with magnitude 1 and 2 respectively having `veca.vecb=sqrt3` a)`pi/3` b)`pi/4` c)`pi/6` d)`pi/2`

A

`pi/3`

B

`pi/4`

C

`pi/6`

D

`pi/2`

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