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If |veca|=2,|vecb|=7 and veca.vecb= 7, t...

If `|veca|=2,|vecb|=7` and `veca.vecb`= 7, then angle between `veca` and `vecb` equals to ,

A

0

B

`pi//3`

C

`pi//6`

D

`pi//2`

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