COTAN
| Date | Clue |
|---|---|
| 2024-12-13 | Trig ratio |
| 2022-07-09 | Ratio of two sides in a right-angled triangle, in brief |
| 2021-04-21 | Trig ratio |
| 2013-11-10 | Trig ratio |
| 2012-04-19 | Trig function |
| 2010-08-21 | Trig ratio |
| 1999-12-05 | Right-triangle ratio, for short |
| 1994-12-20 | Trig function |