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
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Displaying values when using a formula in Spreadsheet mode - Casio Classwiz fx-991EX fx-570EX - YouTube
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Show a Trigonometry Graph transformation on your mobile device via QR codes fx-991EX Casio Classwiz - YouTube
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fx-991EX Graphing the Absolute Value Function w/A Scientific Calculator - YouTube
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fx991EX Functions, Tables, Regressions and Visualization with QR Code Mini-Math Lesson) - YouTube
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Setting the domain for a graph of a function on a Casio fx-CG50 Calculator - YouTube
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One-Variable Statistics and Visualization with the fx-991EX Scientific Calculator – Blog: Strategies, Resources, & EdTech Tips
