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cos(1.57079632) is a bit of a torture test. : r/calculators

CASIO FX-991ES Plus 1st Edit Functional Scientific 10+2Digit Calculator Student

The ClassWiz features a high-resolution display - making it easier to view numerical formulas and symbols. The ClassWiz makes it possible to display on the screen twice the number of characters in normal size and six times the number in small size compared with previous models. A high-performance processor and twice the memory of previous models ensure speedy operation and superior computational power.

Casio Fx-991ex ClassWiz Scientific Calculator, LCD Display 552 Functions - Black

Casio FX-82MS Calculator 2nd Edition Functional 10+2 Digit Scientific Calculator

ARE YOU BUYING GENUINE CASIO SCIENTIFIC CALCULATOR?

fx-991EX, ClassWiz, Non programmable, scientific calculator

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ARE YOU BUYING GENUINE CASIO SCIENTIFIC CALCULATOR?

How To Check Original Casio Fx-991ex - HTE Babgladesh