Online calculator simulators?

[pauln]

(07-09-2022 09:17 PM)Albert Chan Wrote:  This has less to do with calculators, and more to do with math.

sin(9°) = sin(pi/20) ≈ pi/20
cos(sin(9°)°) ≈ cos(pi/20 * pi/180) ≈ 1 - (pi^2/3600)^2 / 2! ≈ 0.999996

We had lost 5+ digits precision, due to catastrophic cancellation.
That's why all calculator forensic test will lose 5 to 6 digits precisions.
This is true even if all calculations produce correctly rounded results!
[...]

This is a great observation. I have always found this test a little bit arbitrary and dubious, for the exact same reasons.

(It is a good test though to differentiate emulators from simulators.)

1 sin cos tan arctan arccos arcsin

in radians would have been a much better test.