Obtain all zeros of the polynomial \( f(x)=x^{4}-3 x^{3}-x^{2}+9 x-...

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Obtain all zeros of the polynomial \( f(x)=x^{4}-3 x^{3}-x^{2}+9 x-6 \), if two of its zeros are
(W) \( -\sqrt{3} \) and \( \sqrt{3} \).
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