INTRODUCTION (c) Africa Studio/Shutterstock.com Electronic, electromechanical electronic devices that automatize mathematical calculations are called calculators. Calculators perform calculations using the basic Arithmetic functions, including subtraction, multiplication, and division--and many can also perform more complex calculations, including frequente and inverse trigonometric calculations ( see trigonometry). There are few inventions that have had as significant an influence on the daily routine like the handheld, or pocket electronic calculator . These calculators can be used to help save time as well as to decrease chances of making mistakes and can be found in places where individuals are frequently in contact with numbers, such as stores, offices, banks and schools, labs, as well as in private homes. Early calculators were mechanical: they computed using components of machines, such as disks, drums, and gears--that were powered via hand, and later elect...
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