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If the equation whose roots are the squa...

If the equation whose roots are the squares of the roots of the cubic `x^3-a x^2+b x-1=0` is identical with the given cubic equation, then (A) `a=0,b=3` (B) `a=b=0` (C) `a=b=3` (D) `a ,b ,` are roots of`x^2+x+2=0`

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