[mads]

Back in the 80's, when I made demos on the C64, we also used pre-calculated sines. I remember going to the library to get a book with the values.

[albrewer]

Abramowitz and Stegun's Handbook of Mathematical Functions[0] - I still use it to test whenever I need to implement any kind of fundamental math function that's not built into whatever environment I'm using. Haven't used it in some time but it comes in handy.

[0]https://en.wikipedia.org/wiki/Abramowitz_and_Stegun

[nwellnhof]

I just wrote a BASIC program generating values using the SIN function [1] and poked them into memory.

[1] https://www.c64-wiki.com/wiki/SIN