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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 ...
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.
Signs of trigonometric functions in each quadrant. All Students Take Calculus is a mnemonic for the sign of each trigonometric functions in each quadrant of the plane. The letters ASTC signify which of the trigonometric functions are positive, starting in the top right 1st quadrant and moving counterclockwise through quadrants 2 to 4.
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.
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Symbol Name Meaning SI unit of measure alpha: alpha particle: angular acceleration: radian per second squared (rad/s 2) fine-structure constant: unitless beta: velocity in terms of the speed of light c: unitless beta particle: gamma: Lorentz factor: unitless photon: gamma ray: shear strain: radian
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.