Casio FX-991DEX Calculator

FEATURES:
- High-resolution LC display with 192 x 63 pixels
- Natural representation
- 696 functions
- Icon menu
- Spreadsheet
- QR code function
- Solving equations and systems of equations of the fourth order
- 4X4 matrices
- Vector calculation
- Integral / differential calculation
- Calculating with engineering units
- 164 unit conversions
- 47 scientific constants
- German user language
- Solar / battery operation
- Distribution functions (normal distribution and inverse normal distribution, binomial distribution, Poisson distribution)
- Solving inequalities
- Calculation of the minimum and maximum of a function
- Improved equation solver
- Calculation of step shape and reduced step shape of matrices (Ref / Rref)
- Periodic decimal fraction
- Integer random numbers
- Prime factorization
- Verify function: Check whether two expressions are equal
- Calculation of products with a finite number of factors
- Divide whole numbers with remainder
- Statistical calculation of quartiles
- GCD and LCM function
- Table of values
- Repeat function
- 24 levels of brackets
- Variable memory (9)
- STO / RCL button
- Trigonometric and inverse trigonometric functions
- Hyperbolic and inverse hyperbolic functions
- Exponential functions10x, ex
- Inverse function x-1
- Power and root functions x√, √, x2, xy
- Logarithmic functions (log, ln)
- Combinatorics and Permutation
- Random number generator
- Conversion of polar coordinates into right-angled coordinates and inverse
- Fractional calculation (two modes)
- Conversion from sexagesimal to decimal and inverse
- Calculations in grads, degrees and radians
- Π key, e key and% key
- SCI / FIX / ENG function
- List based statistics
- Statistics with one variable
- Standard deviation
- Two variable statistics (regression functions)
- Solve / Calc
- Numerical integration
- Numerical differentiation
- ∑ () function
- Calculating with complex numbers
- Calculations on base n
- Non-natural input (like the MS models)

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