Calculator is a mechanical or electronic instruments that help humans calculate math problems and get an answer quickly, because there is an electronic circuit and recorded within it. At present, there are calculators capable of very high. Graph the trigonometric formulas can be made free.
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In the past have no electronics knowledge. Mechanical tool is used to calculate various figures, such as in China, lukkhit will be used. Best Western, which has a very mathematical, abaci, comptometers, Napier bones, Slide rules and more
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