If \( \alpha \) and \( \beta \) are the zeros of the quadratic poly...

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If \( \alpha \) and \( \beta \) are the zeros of the quadratic polynomial \( f(x)=x^{2}-x-4 \), find the value of
\[
\frac{1}{\alpha}+\frac{1}{\beta}-\alpha \beta
\]
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