S and C functions

6 · John Cook · Aug. 14, 2021, 12:46 p.m.
I was reading a book on orbital mechanics recently [1], and one of the things that stood out was the use of two variations on sine and cosine, functions the book denotes by S and C. Strictly speaking, the functions are defined to be the analytic continuation of the middle expressions to the full complex […] The post S and C functions first appeared on John D. Cook....