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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 ...
Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.
Haft Seen traditional table of Norouz Sofre-ye Haft-Sin : sofre (tablecloth), haft (seven), sin (the letter S [س]). Al-Bīrūnī said: Haft-sin came from Jamshid since he destroyed the evil that made Persian lands weak, so on the first day of Iranian calendar people celebrated Norouz and they put 7 different symbolic items on their table as a ...
The Haft-sin table may also include a mirror, candles, painted eggs, a bowl of water, goldfish, coins, hyacinth, and traditional confectioneries. A "book of wisdom" such as the Quran, Bible, Avesta, the Šāhnāme of Ferdowsi, or the divān of Hafez may also be included. [81] Haft-sin's origins are not clear.
Ptolemy's theorem states that the sum of the products of the lengths of opposite sides is equal to the product of the lengths of the diagonals. When those side-lengths are expressed in terms of the sin and cos values shown in the figure above, this yields the angle sum trigonometric identity for sine: sin(α + β) = sin α cos β + cos α sin β.
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.
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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