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Trigonometrikus azonosság

Auteur:Száldobágyi Zsigmond
Forrás: Alexander Bogomolny, A Quick Proof of cos(pi/7)cos(2.pi/7)cos(3.pi/7)=1/8 from Interactive Mathematics Miscellany and Puzzles https://www.cut-the-knot.org/pythagoras/CosCosCos.shtml, Accessed 10 May 2018

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