Can it handle complex numbers in matrix ?

Yes. .or say within reason. Download the manual from Casio, its free and you dont need to buy calculator.. Look at page 114 and 107. Make sure you download fx-991CW...not fx-991.

¿Este artículo tiene garantía?

Good afternoon, I bought the calculators without a guarantee, but I really don't know if the product has a guarantee, although they should have a guarantee. Regards, AC.

when you turn off the calculator, the calculation history is deleted or not?

The data is deleted when you turn it off. It's the only thing that keeps it from being the perfect scientific calculator for me.

is there a ohms law calculator?

Well any calculator can "do" Ohms law. If ypur worried about remembering it, any programming calculator can store formulas for you...Calculated Industries (yellow calculators) makes 2 Electrical calculators, pretty sure both have Ohms law function key.

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Casio FX-991CW Engineering/Scientific Calculator - High Resolution Display, Solar Powered, Black

Product ID: 739609094

Details

Brand
Casio
Calculator Type
Colour
Black
Power Source
Solar Powered
Screen Size
2.25 Inches

📊High-res 2.25" display

🔋Solar powered + battery backup

🧮552 advanced functions

Description

🧠 Elevate your calculations—because precision is the new power move.

EFFORTLESS NAVIGATION - Intuitive cursor keys and rounded keys make inputting data smooth and error-free—speed up your workflow.
SEAMLESS DIGITAL SYNC - Compatible with ClassPad.net for easy data transfer and enhanced study or work collaboration.
POWER THAT NEVER QUITS - Solar-powered with LR44 battery backup ensures uninterrupted performance wherever you crunch numbers.
MASTER OF MATH FUNCTIONS - 552 built-in functions including numeric integration, differentiation, and polynomial solvers for every engineering challenge.
CRYSTAL CLEAR VISUALIZATION - High-resolution display shows complex data and 4x4 matrices with textbook-perfect clarity.

The Casio FX-991CW is a sleek, solar-powered scientific calculator featuring a high-resolution 2.25-inch LCD that displays textbook-style symbols and numbers. With 552 advanced functions including numeric integration, differentiation, and polynomial solvers, it’s designed for professionals and students who demand accuracy and efficiency. Its intuitive navigation, rounded keys, and compatibility with ClassPad.net make it a must-have tool for mastering complex calculations on the go.

Specifications

ASIN	B0BSJ33C4R
Brand Name	Casio
Calculator Type	Engineering/Scientific
Colour	Black
Customer Reviews	4.7 4.7 out of 5 stars (2,209)
Display Type	LCD
Enclosure Material	Plastic
Item Dimensions L x W	16L x 7.6W Centimeters
Item Type Name	Casio Advanced Scientific Calculator
Item Weight Unit of Measure	3.35 Ounces
Manufacturer	Casio
Manufacturer Part Number	FX-991EX
Model Name	FX-991CW
Model Number	FX-991CW
Number of Batteries	1 LR44 batteries required. (included)
Number of Items	1
Power Source	Solar Powered
Screen Size Unit of Measure	2.25 Inches
UPC	889232615011
Unit Count	1.0 Count

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