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[" Let "alpha,beta" be real and "z" be a...

[" 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(0,1)," (b) "beta in(-1,0)," (c) "| beta|=1," (d) "beta in(1,oo)]]

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