Negotiable

                                            Casio fx 991 Es plus
580 integrated functions
The "natural display" enables you to enter fractions, square roots and other numerical expressions in the same way and display them exactly as they will appear in your textbook.
Display: Natural-V.P.A.M., LCD (Dot-Matrix), 31 x 96 dots, 10 + 2 digits
NEW: Distribution functions (Normal distribution and inverse normal distribution)
NEW: Calculation of maximum and minimum of a function
NEW: enhanced equation solver
NEW: recurring decimal fractions
NEW: Random integers
NEW: statistical calculation of quartiles
NEW: 40 Unit conversions
Integral and differential calculus
40 physical constants
20 pairs of values for metric conversions
Solving of equations (linear, high-order)
1 accumulative memory and 6 constant memories
Automatic fraction calculator (two modes)
Functions table
Function calculation using the Calc key (temporary formula memory)
SCI/FIX
24 levels of parentheses
Repeat/correction function
Numeric integration/numeric differentiation
Base n calculations (BIN/OCT/DEC/HEX)
Calculation in degree, grad and radian
Converts polar coordinates into rectangular coordinates and vice versa
Calculation with complex numbers
Matrix and vector operations
Statistics (List-based statistics with 1 & 2 variables)
Logical operations
Permutations and combinatorics
Random number generator
Energy supply: Solar powered with an auxiliary battery                                    

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