If `vec(a_(1)) and vec(a_(2))`are two non-collinear unit vectors and if `|vec(a_(1))

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