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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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fx-991EX: Creating a Table and Finding a Regression - YouTube
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Casio FX-991EX Classwiz Hyperbolic Functions - YouTube
מחשבון מדעי Casio FX-991EX
CASIO FX-991EX Classwiz Advanced Scientific Calculator - 552 Functions – In Deals We Trust
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Ten Key functions of the Casio fx-991EX Classwiz non-programmable scientific Calculator - YouTube
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Casio fx-991EX classWiz user manual and commands. | PDF
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Memory Functions fx-991EX - Casio Calculators
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