Complex Numbers: Using the Casio fx-CG50 in Cartesian and Polar forms - YouTube
Casio Classwiz Complex Mode - Input a complex number and find argument ( Casio Calculator, 991EX) | Complex numbers, Calculator, Graphing calculator
Casio fx-CG50 PRIZM calculator review - The Gadgeteer
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Eddie's Math and Calculator Blog: Casio fx-CG50 Review (updated 3/2/2018)
Casio fx-991EX keeps giving math error for simple calculations like ((1/2)/2) and sin inverse (10) etc. Any idea on how to fix this? Is there a chance that the calculator may be
Calculate and solve equations with complex numbers using the fx CG50 - YouTube
Update: It really does go without saying, the FX-CG50 is a beast of a calculator. But my trusty FX-991EX is still good for a lot of things. They are both good calculators. :
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Can Casio 991 ES plus solve linear equations with complex numbers as the coefficient of the variables? - Quora