HP’s Solve & Integrate-Still ahead of its time.

[carey]

(10-29-2023 07:43 PM)Matt Agajanian Wrote:  Several months ago I tried that integral with my
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Casio fx-115ES Plus (editions 1 and 2)
Casio fx-991ES Plus 2nd Edition
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With the Casio & Sharp models, I needed to put 10^-9 (or smaller) as the lower limit so I could obtain that 1.6054 result. Clearly, the 34C algorithm knows how to integrate better than the TI, Sharp, & Casio which use Simpson's method.

The Casio User's Guide for the fx-115ES PLUS and fx-991ES PLUS 2nd Edition says they use the Gauss-Kronrod method.