INTRODUCTION (c) Africa Studio/Shutterstock.com Mechanical, electromechanical electronic or electromechanical devices that do mathematical calculations automatically are known as calculators. Calculators perform calculations using the basic Arithmetic operations--subtraction, addition multiplicationand division. They can also perform more complex calculations, like indistinto trigonometric functions as well as inverse trigonometric ( see trigonometry). Few technological innovations in recent years have had as significant an influence on our lives as the handheld, also known as a pocket electronic calculator . These calculators can be used to help save time and reduce the risk of making errors and are used wherever there are people who frequently deal with numbers - in offices, retail stores, banks and laboratories, in schools, and even in homes. The early calculators were mechanical: they made calculations using machine components, like disks, drums, and gea...
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