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If alpha,beta are the zeros of the polyn...

If `alpha,beta` are the zeros of the polynomial `f(x)=a x^2+b x+c ,` then `1/(alpha^2)+1/(beta^2)=` `(b^2-2a c)/(a^2)` (b) `(b^2-2a c)/(c^2)` (c) `(b^2+2a c)/(a^2)` (d) `(b^2+2a c)/(c^2)`

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