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[" Let "S" denote the set of real values...

[" Let "S" denote the set of real values of "'a'" for which the roots of the equation "x^(2)-ax-a^(2)=0],[" exceed 'a' Then S equals to "],[[" (A) "(-oo,0)," (B) "(-2,-1/2)],[" (C) "(-1/2,1/4)," (D) null set "]]

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