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veca1 and veca2 two non-collinear unit v...

`veca_1 and veca_2` two non-collinear unit vectors and `|veca_1+veca_2|=sqrt(3)`. Find out the value of `(veca_1-veca_2)*(2veca_1+veca_2)`.

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The correct Answer is:
`1/2`
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