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IMO 1962 Problem 4

  • Day 2

Solve the equation cos⁡2x+cos⁡22x+cos⁡23x=1\cos^2{x}+\cos^2{2x}+\cos^2{3x}=1

Dataset text AI-MO AoPS. Quoted with source.

Official text: IMO 1962 official English paper, page 1.

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