INTRODUCTION (c) Africa Studio/Shutterstock.com Electromechanical, mechanical electronic , or electronic devices that perform mathematical operations automatically are referred to as calculators. Calculators perform calculations using the fundamental mathematical functions like subtraction, addition, division, and multiplication. Many can also do more complicated calculations, like usual trigonometric functions as well as inverse trigonometric ( see trigonometry). There are few inventions that have had as significant an influence on our lives as the handheld or pocket, electronic calculator . These calculators can be used to help save time and decrease the likelihood of making mistakes and are found wherever you need to be able to use numbers frequently, in offices, retail stores, banks and laboratories, in schools, as well as in private homes. The first calculators were mechanical. they made calculations using components of machines, such as disks, drums, and gea...
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