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[" 13.If "x in R" then "(x^(2)+2x+a)/(x^...

[" 13.If "x in R" then "(x^(2)+2x+a)/(x^(2)+4x+3a)" can take all real values if "],[[" (1) "a in(0,2)," (2) "a in(0,1)],[" (3) "a in[-1,1]," (4) None of "]]

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