Given |veca|=|vecb|=1 and |veca + vecb|=...

Given `|veca|=|vecb|=1 and |veca + vecb|= sqrt3` if `vecc` is a vector such that `vecc -veca - 2vecb = 3(veca xx vecb) ` then find the value of `vecc . vecb`.

A

`sqrt(55)`

B

`sqrt(51)`

C

`sqrt(43)`

D

`sqrt(37)`

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A

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