Why do I often find the interval t in Euler's polynomial is often different, some say $|t|<π$ & some say $|t|<2π$. Why is that, at first I thought |t| this has no effect in the series since this Euler series departs from $\frac{1}{cos(t)}$. Can anyone explain this?
2026-02-23 22:21:15.1771885275
can someone help explain the t interval in this series
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