Casio fx-5800P Natural textbook display / 4-line display Programmable Calculators

Features
Natural Textbook Display and MORE POWERFUL Program Functions
Program function
Matrix calculations
Differential and integration
Recursions
Solve function
Complex number calculations
Base-n calculations
Data transmission between two fx-5800P calculators
Differential and quadratic differential calculations
26 to 2398 variables
Fraction calculations
40 scientific constants
128 built-in formulas
Multi-replay function
Statistics (List-based Statistics, Standard deviation, Regression analysis)
Integrated hard case swings back a full 360 degrees.