Found this incredible function on my Fx991EX if you press shift and Option button on left corner it creates a QR code that can be scanned with a phone to see graphing
.jpg "Casio FX-991EX Classwiz Non-Programmable Scientific Calculator; 552 Functions with Menu Driven Interface| InkCaboodle.com")
Casio FX-991EX Classwiz Non-Programmable Scientific Calculator; 552 Functions with Menu Driven Interface| InkCaboodle.com
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