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$f(x)=x^3-2x^2+6x-1=0$

The three roots of the above equation are $\alpha,\beta,\gamma$, then what is

$\frac{\alpha}{\alpha^2-\alpha+1}+\frac{\beta}{\beta^2-\beta+1}+\frac{\gamma}{\gamma^2-\gamma+1}=?$

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