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[154],[" 3.Let "alpha,beta" be real and ...

[154],[" 3.Let "alpha,beta" be real and "z" be a complex number.If "],[z^(2)+alpha z+beta=0" has two distinct roots on the line Re "z=1" ,"],[" then it is necessary that: "],[[" (a) "beta in(-1,0)," (b) "| beta|=1],[" (c) "beta in(1,oo)," (d) "beta in(0,1)]]

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