After tonight’s calculus exam I will switch fully to student-mode to study for my Wednesday morning final. Then back to instructor-mode to grade the calc final. Something something, duality of grad school

Solution 11693: Algorithm for Solving Trigonometric Functions (Sine, Cosine and Tangent) on Texas Instruments' Graphing Calculators. Solution 11693: Algorithm for Solving Trigonometric Functions (Sine, Cosine and Tangent) on Texas Instruments' Graphing Calculators.

here is a bit more directly from TI’s website

education.ti.com/en/customer-...

TI Math Internals - Cemetech | Forum | TI-BASIC [Topic]

www.cemetech.net/forum/viewto...
I have not checked their citations, but from their conclusions it seems to be that, for TI, the CC-40, TI-74, and TI-95 use (Chebyshev-esque, not Taylor series) polynomial approximations, while all the rest have used CORDIC