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[" 4.If the roots of the cubic equation ...

[" 4.If the roots of the cubic equation "ax^(3)+bx^(2)+cx+d" are in GP,then "],[[" a."c^(3)a=b^(3)d," b."ca^(3)=bd^(3)," c."a^(3)b=c^(3)d," d."ab^(3)=cd^(3)]]

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