Question
If $1$, $\omega$, $\omega^2$ are three cube roots of unity, then $(1 - \omega + \omega^2)(1 + \omega - \omega^2)$ is __
If $1$, $\omega$, $\omega^2$ are three cube roots of unity, then $(1 - \omega + \omega^2)(1 + \omega - \omega^2)$ is __