Historical clue formulations

• Modern lead-in to play — 2026-01-26
• Derivative of sin — 2025-10-24
• Counterpart of sin, in trigonometry — 2024-12-23
• Graphing calculator button — 2024-06-30
• Fortune 500 listings: Abbr. — 2023-03-13
• Sin : y-axis :: ___ : x-axis — 2022-11-16
• sin/tan — 2021-08-22
• Trig function — 2021-08-06
• Sin's counterpart — 2021-02-28
• Trig function — 2021-02-20
• Nasdaq listings: Abbr. — 2020-12-16
• Counterpart of sin — 2020-02-13
• Trig calculation — 2019-09-15
• Fortune 500 listings: Abbr. — 2019-08-12
• Secant's reciprocal: Abbr. — 2018-02-16
• What's not a sin in math class? — 2017-09-29
• I.R.S. Form 1120 filers: Abbr. — 2017-05-12
• Stock listings: Abbr. — 2017-04-25
• Tan neighbor, on calculators — 2016-05-01
• Exchange listings: Abbr. — 2016-01-02
• G.E. and G.M. — 2015-07-05
• G.M. and G.E. — 2014-10-22
• Trig. function — 2014-08-06
• Trig. function — 2014-02-09
• N.Y.S.E. listings — 2014-01-15
• ___ Cob, Conn. — 2014-01-01
• Fortune subjects: Abbr. — 2013-12-07
• Market makeup: Abbr. — 2013-11-24
• Function of mathematics: Abbr. — 2013-05-31
• 1/sec, in trig — 2013-02-06
• Bldg. directory listings — 2012-05-06
• Calculator button — 2012-04-28
• Abbr. in trig — 2012-04-22
• S.&P. 500 listings: Abbr. — 2012-04-03
• Stock page listings: Abbr. — 2012-01-15
• Firms: Abbr. — 2010-07-05
• N.Y.S.E. listings — 2010-04-28
• "I Spy" co-star Bill, familiarly — 2009-10-05
• Firms: Abbr. — 2009-09-21
• Orgs. with "Inc." in their names — 2009-04-29
• Amex listings: Abbr. — 2009-01-24
• Dow Jones listings: Abbr. — 2008-11-25
• Fortune 500 listings: Abbr. — 2008-11-11
• Trig ratio: Abbr. — 2008-06-30
• Romaine — 2008-05-11
• W.S.J. subjects — 2007-11-30
• Nasdaq listings: Abbr. — 2007-09-23
• Calculator button — 2007-08-23
• Lettuce variety — 2007-06-23
• Comedian Bill, informally — 2006-12-11