If $\alpha=1$ and $\beta=1+i \sqrt{2}$, where $i=\sqrt{-1}$ are two roots of the equation $x^3+a x^2+b x+c=0, a, b, c \in \mathrm{i}$, then $\int_{-1}^1\left(x^3+a x^2+b x+c\right) d x$ is equal to:
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