If `veca` and `vecb` are two non-collinear unit vectors (2))(2veca_(1) +veca_(2))` is:

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If `veca` and `vecb` are two non-collinear unit vectors and if `|veca_(1) + veca_(2)|=sqrt(3)`, then the value of `(veca_(1) -veca_(2))(2veca_(1) +veca_(2))` is:
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