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∏k=12016(2−2cos((2k−1)π2×2016))= ? \large\prod_{k=1}^{2016}\left(\sqrt{2}-2\cos\left(\frac{(2k-1)\pi}{2\times 2016}\right)\right) = \, ? k=1∏2016(2−2cos(2×2016(2k−1)π))=?
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