Historical clue formulations

• High-level H.S. class with derivatives — 2026-09-20
• H.S. course covering integrals — 2026-07-30
• H.S. math for some college-bound students — 2020-12-15
• High-level H.S. math class — 2020-03-15
• High-level H.S. class with integrals — 2017-10-17