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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 ...
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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.
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.
In the table below, the label "Undefined" represents a ratio : If the codomain of the trigonometric functions is taken to be the real numbers these entries are undefined , whereas if the codomain is taken to be the projectively extended real numbers , these entries take the value ∞ {\displaystyle \infty } (see division by zero ).
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.
[7]: 3 The Persian calendar New Year, No Ruz, is a two-week period celebrated at the vernal equinox which includes playing Buzkashi, considered Afghanistan's national sport, and eating samanak and haft mewah or haft mewa, which translates to "7 fruits" and is a dish of 7 dried fruits and nuts typically including raisins and golden raisins ...