Approximate pi to 24 digits via keyboard

[PANAMATIK]

(01-30-2015 06:35 PM)Rick314 Wrote:  This works with several HP calculators I've tried it on, but not on other scientific calculators like a TI-83+ for example. In radians, for eps << 1, sin(pi - eps) = sin(pi)*cos(eps) - cos(pi)*sin(eps) = 0 - (-1)*sin(eps) = sin(eps) ~= eps. So:

sin(3.14159265358) * 1e12 = 9.79323846264, the next 12 digits of pi (3.14159265358979323846264...).

This does not work on any classic HP-35, HP-45 ... or woodstock calculators HP-21,HP-25,HP-27 ... with 56-bit BCD arithmetik.

Bernhard