Casio FX991ES Plus 2nd edition

Scientific calculator. The "Natural V. P. A. M." LCD displays fractions and square roots as seen in textbooks. It offers 580 functions, including distribution functions and solving inequalities. Additionally, it allows for the calculation of the minimum and maximum of a function. The power supply is provided by a solar cell with a backup battery. The menu is in German, and the cursor keys are clearly arranged. Highlight features of the calculator include distribution functions (normal distribution and inverse normal distribution, binomial distribution, Poisson distribution), solving inequalities, and calculating the minimum and maximum of a function. The FX-991DE Plus also handles the calculation of row echelon form and reduced row echelon form of matrices, periodic decimal fractions, and equality testing of two expressions. It enables conversion between sexagesimal and decimal as well as between polar coordinates and rectangular coordinates. The FX-991DE Plus easily converts from sexagesimal to decimal and vice versa. It calculates in new degrees, old degrees, and radians, providing calculations of polar coordinates to rectangular coordinates and vice versa. The calculator is also equipped with a random number generator. Hundreds of additional functions are available. Other features of the FX-991DE Plus include prime factorization, division of whole numbers with a remainder, calculation of products with a finite number of factors, statistical calculations of quartiles, GCD and LCM functions, integral and differential calculations, as well as matrix and vector operations. The calculator is powered by a solar cell with a backup battery and comes with a hard case.