Ленская Наталия, Когда косинус угла правильного n-угольника является квадратичной иррациональностью
ММКШ 2023
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![Самый долгий эволюционный эксперимент [Veritasium]](https://sun9-75.userapi.com/XRWpWFB2mHGY-BEJf7OW40fGNcbR4hUrgrSSeg/-NzVKHSs1A4.jpg)
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