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The painting depicts Haft-seen symbols of Nowruz being related to elements of Fire, Earth, Air, Water, and the three life forms of Humans, Animals and Plants. Haft-seen table. Haft Seen or Haft sin ( Persian : هفتسین ) is an arrangement of seven symbolic items which names start with the letter " س " (pronounced as "seen"), the 15th ...
In mathematics, tables of trigonometric functions are useful in a number of areas. Before the existence of pocket calculators, trigonometric tables were essential for navigation, science and engineering. The calculation of mathematical tables was an important area of study, which led to the development of the first mechanical computing devices.
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Mathematical tables are lists of numbers showing the results of a calculation with varying arguments.Trigonometric tables were used in ancient Greece and India for applications to astronomy and celestial navigation, and continued to be widely used until electronic calculators became cheap and plentiful in the 1970s, in order to simplify and drastically speed up computation.
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