ARCTAN
Set to 2 different clues across 2 published puzzles, most often “Inverse trig function” — The New York Times, Friday, 24 December 2010.
6 letters
Every clue on record, most used first
- Inverse trig functiononce
The New York Times — Friday, 24 December 2010
- Certain inverse functiononce
The New York Times — Friday, 7 March 2008