Can the spreadsheet salvage the 991CW

[Dave Britten]

(08-30-2024 05:14 AM)lrdheat Wrote:  I noticed on the SwissMicros forum where a discussion on the WP 34S dealing with the accuracy of its integration of e^(cos(x) * sin(x)) from 0 to 100. The actual value is 106.49243824200123… on the 991EX, 9750 giii, and CG-50, the answer comes up as 106.4923778, incorrect beginning with the 4th decimal. Interestingly, the 991CW comes up with 106.4924382, and when I subtract 106.4924382 from this, I get the rest of what was in the result internally, namely 4.200123*10^-08 which is right on target! I imagine that this is due to the CW doing calculations internally to 10^-17 to as fine as 10^-22.

Despite Casio's missteps on the menu design, it is nevertheless quite impressive that they managed to not only increase the numerical precision considerably, but also make the calculator faster at the same time.