a post on "trigonomial functions" #iTeachMath ♾️ created for PROMYS for Teachers 2.0: docs.google.com/presentation... tl;dr Can you write cos(nx) as a polynomial in cos(x)? e.g., cos(2x) = -1 + cos^2(x) In our notation, this would become: T_2(x) = -1 + x^2 🚨no spoilers if you've seen it before!🚨
Presentation: Trigonomial Functions
Trigonomial Functions Dmitry, Benjamin, Tyler PROMYS for Teachers 2.0 2026 CE, Summer
docs.google.com