Mathematica(@mathemetica ):Carl Friedrich Gauss (1777–1855) derived the exact value of cos(2π/17) This remarkable expression was part of his proof that a regular 17-gon is constructible with compass and straightedge; one of the great achievements in the history of mathematics. cos(2π/17) = [-1 + √17 + √(34 - 2√17) + 2√17 + 3√17 - √(34 - 2√17)

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Mathematica@mathemetica

2026.05.13 17:07

Carl Friedrich Gauss (1777–1855) derived the exact value of cos(2π/17) This remarkable expression was part of his proof that a regular 17-gon is constructible with compass and straightedge; one of the great achievements in the history of mathematics. cos(2π/17) = [-1 + √17 + √(34 - 2√17) + 2√17 + 3√17 - √(34 - 2√17) - 2√34 + 2√17] / 16