15 is the product of distinct Fermat primes, 3 and 5; hence, a regular pentadecagon is constructible with a compass and unmarked straightedge, and cos ⁡ π 15 {\displaystyle \cos …

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Nov 5, 2025 · Fifteenth Amendment is an amendment (1870) to the U.S. Constitution that guaranteed that the right to vote could not be denied based on ‘race, color, or previous …