Find the value of the product ∏k=1n−1(1−ωk)\prod_{k=1}^{n-1} (1 - \omega^k)∏k=1n−1(1−ωk) where ω=ei2π/n\omega = e^{i2\pi/n}ω=ei2π/n and n=4n=4n=4.
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