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IF |veca|=sqrt(3), |vecb|=2 and |veca-ve...

IF `|veca|=sqrt(3), |vecb|=2 and |veca-vecb|=3` find the angle between `veca and vecb.

A

`4 sqrt(3)`

B

`6sqrt(3)`

C

`12 sqrt(3)`

D

`18sqrt(3)`

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