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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))*(2vec a_(1)+vec a_(2))" is: "],[[" 1) "2," 2) "3/2," 3) "1/2," 4) "1]]

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