INTRODUCTION (c) Africa Studio/Shutterstock.com Mechanical, electromechanical electronic or electromechanical devices that perform mathematical operations automatically are called calculators. Calculators perform calculators perform essential mathematical functions like subtraction, addition, division, and multiplication. Many can also do more complicated calculations, like cotidiano and inverse trigonometric function ( see trigonometry). The few innovations of the past decade have had such a profound influence on daily life as the handheld, also known as a pocket, electronic calculator . These calculators are used to cut down on time and to reduce the likelihood of making mistakes and are used wherever people deal frequently with numbers--in office spaces, in banks, stores as well as in laboratories, schools as well as in private homes. The earliest calculators were mechanical: they performed their computations using machine parts--such as disks, gears, and...
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