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If alpha,betaandgamma are the zeros of t...

If `alpha,betaandgamma` are the zeros of the polynomial `f(x)=ax^(3)+bx^(2)+cx+d`, then `alpha^(2)+beta^(2)+gamma^(2)` is equal to

A

`(b^(2)-ac)/(a^(2))`

B

`(b^(2)-2ac)/(a)`

C

`(b^(2)+2ac)/(b^(2))`

D

`(b^(2)-2ac)/(a^(2))`

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