1 October 2024

• curprev 08:0508:05, 1 October 2024 Ronnie 735 talk contribs m 4,669 bytes +3 →Solution 2

14 October 2023

• curprev 18:3418:34, 14 October 2023 Yiyj1 talk contribs 4,666 bytes +1,077 →Solution 4

8 December 2022

• curprev 15:2615:26, 8 December 2022 Mathboy100 talk contribs 3,589 bytes +2 →Solution
• curprev 15:2615:26, 8 December 2022 Mathboy100 talk contribs 3,587 bytes +1 →Solution
• curprev 15:2615:26, 8 December 2022 Mathboy100 talk contribs 3,586 bytes +24 →Solution
• curprev 15:2515:25, 8 December 2022 Mathboy100 talk contribs 3,562 bytes +39 →Solution
• curprev 15:2415:24, 8 December 2022 Mathboy100 talk contribs 3,523 bytes +1,149 No edit summary

21 July 2022

• curprev 04:1104:11, 21 July 2022 Aqj talk contribs 2,374 bytes −14 No edit summary

8 July 2021

• curprev 19:4119:41, 8 July 2021 Yofro talk contribs 2,388 bytes +8 →Solution 3
• curprev 19:4119:41, 8 July 2021 Yofro talk contribs 2,380 bytes +631 →Solution 2
• curprev 19:4019:40, 8 July 2021 Yofro talk contribs 1,749 bytes −640 →Solution 2
• curprev 19:4019:40, 8 July 2021 Yofro talk contribs 2,389 bytes +640 →Solution 2

29 March 2012

• curprev 10:1310:13, 29 March 2012 1=2 talk contribs 1,749 bytes +1,310 LaTeX'd solution, added my own

24 November 2009

• curprev 13:4813:48, 24 November 2009 Suvamghosh talk contribs 439 bytes +4 →Solution
• curprev 13:4613:46, 24 November 2009 Suvamghosh talk contribs 435 bytes +245 No edit summary

30 December 2008

• curprev 17:2317:23, 30 December 2008 Minsoens talk contribs 190 bytes +190 New page: ==Problem== Prove that <math>\cos{\frac{\pi}{7}}-\cos{\frac{2\pi}{7}}+\cos{\frac{3\pi}{7}}=\frac{1}{2}</math>. ==Solution== {{solution}} ==See Also== {{IMO box|year=1963|num-b=4|num-a=6...