Native mode of trig functions?

[Thomas Klemm]

(10-11-2024 04:30 PM)Albert Chan Wrote:  We define "more accurate" in the statistical sense.

Can you elaborate in that?

My point is that you can't enter \(\frac{\pi}{5}\) into a calculator.
So we always start with an approximation.
But in case of \(36^{\circ}\) we can start with the exact value.

Interestingly I get the following result on an HP-41C:

RAD
PI
5
/
COS

0.8090169943

Which is not the correctly rounded result of \(\cos\left(\frac{\pi}{5}\right)\).