robinhouston on Nostr: Yes, trig functions are defined using exponentials and i. This table from the ...

Yes, trig functions are defined using exponentials and i. This table from the supplementary information document shows how each function is defined in terms of functions earlier in the table.

There are definitely some subtleties related to the choice of branch, which is discussed at various points in the paper and the supplementary document, though I won’t pretend I have tried to understand it completely. See the discussion on p. 11 of the paper, for example.