How to pronounce “infinite series” in English

And she tells you there's an infinite series for cosine x.

The teacher never tells you that there's an infinite series for tangent of x, because it's not quite such a nice formula.

A result of that along with some knowledge about infinite series is that you can show that the coefficient in front is actually a positive integer-- which

of course has interactions with Ramanujan and all the wonderful ideas about infinite series,

So for example, modular forms is rooted in just infinite series.

And so, if you know calculus, one of the topics in calculus is infinite series and limits.

When you study calculus, if you get to the end of the second semester and you're still paying attention-- the teacher tells you there's an infinite series for sine of x.