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CASIO fx-991ARX – Casio
Got ahold of a Casio fx-991ex and CG-50 to match my Classpad II. I'm really impressed with them but there is something about the fx-991ex... (see comments) : r/calculators
fx-991EX Graphing the Absolute Value Function w/A Scientific Calculator - YouTube
How to Find Stationary Points Using a Casio CLASSWIZ fx-991EX - YouTube
Data, Roller Coaster's and Using Scientific Calculator for Statistics (fx- 991EX Classwiz w/QR code) – Blog: Strategies, Resources, & EdTech Tips