What is the tag trigonometric-sums intended for. Looking at some questions, it seems that some users use it like this: "If it contains some sum/series and some trigonometric functions, then I'll add this tag."
For comparison, the tag-info on Mathematics gives IMHO a relatively clear guidance for which topics the (trigonometric-series) tag should be used. Maybe this was the intended usage of the trigonometric-sums tag?
However, while question is on hold, it would probably be better to let the OP edit the question first. (They might try to improve the question - if it gets into reopen review queue with nothing but a tag edit, it's definitely not going to be reopened.)
Who first chose the names Alice and Bob for the players (or observers) A and B?
