8 July 2025

• curprev 18:1318:13, 8 July 2025 Mathcosine talk contribs 3,000 bytes +54 →Video Solution 1 by OmegaLearn

4 August 2024

• curprev 08:3308:33, 4 August 2024 Kislay kai 369 talk contribs m 2,946 bytes +9 →Solution 2
• curprev 08:3108:31, 4 August 2024 Kislay kai 369 talk contribs 2,937 bytes +4 →Solution 2

4 December 2023

• curprev 08:5008:50, 4 December 2023 Sl hc talk contribs m 2,933 bytes +16 No edit summary

20 November 2023

• curprev 01:5601:56, 20 November 2023 Professorchenedu talk contribs 2,917 bytes +124 No edit summary

16 November 2023

• curprev 02:5402:54, 16 November 2023 Gabew1234 talk contribs 2,793 bytes 0 →Solution 2
• curprev 02:5402:54, 16 November 2023 Gabew1234 talk contribs 2,793 bytes +34 →Solution 2
• curprev 02:1502:15, 16 November 2023 Pi is 3.14 talk contribs 2,759 bytes +66 No edit summary

15 November 2023

• curprev 19:5619:56, 15 November 2023 Scrabbler94 talk contribs m 2,693 bytes +11 →Solution 3: use \cos and \cosh instead of cos and cosh
• curprev 19:2319:23, 15 November 2023 Kxiang talk contribs 2,682 bytes +910 Solution 3
• curprev 17:4017:40, 15 November 2023 Professorchenedu talk contribs 1,772 bytes +867 No edit summary
• curprev 17:3517:35, 15 November 2023 Atharvnaphade talk contribs 905 bytes +10 →See also
• curprev 17:3317:33, 15 November 2023 Atharvnaphade talk contribs 895 bytes −1 No edit summary
• curprev 17:3217:32, 15 November 2023 Atharvnaphade talk contribs 896 bytes +896 Created page with " ==Problem== A real-valued function <math>f</math> has the property that for all real numbers <math>a</math> and <math>b,</math> <cmath>f(a + b) + f(a - b) = 2f(a) f(b).</cm..."