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- A trigonometric number is a number that can be expressed as the sine or cosine of a rational multiple of π radians. Since the case of a sine can be omitted from this definition. Therefore any trigonometric number can be written as, where k and n are integers. This number can be thought of as the real part of the complex number.en.wikipedia.org/wiki/Exact_trigonometric_values
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Trigonometry | Wikipedia
Trigonometry (from Ancient Greek τρίγωνον (trígōnon) 'triangle' and μέτρον (métron) 'measure') is a branch of mathematics concerned with relationships between angles and side lengths of triangles. In particular, the trigonometric functions relate the angles of a right triangle with ratios of its side lengths. The … See more
Sumerian astronomers studied angle measure, using a division of circles into 360 degrees. They, and later the Babylonians, studied the ratios of the sides of See more
Using the unit circle, one can extend the definitions of trigonometric ratios to all positive and negative arguments (see trigonometric function).
Graphs of … See moreAstronomy
For centuries, spherical trigonometry has been used for locating solar, lunar, and stellar positions, … See moreTrigonometry has been noted for its many identities, that is, equations that are true for all possible inputs.
Identities involving only angles are known as trigonometric … See more• Boyer, Carl B. (1991). A History of Mathematics (Second ed.). John Wiley & Sons, Inc. ISBN 978-0-471-54397-8.
• Nielsen, … See moreWikipedia text under CC-BY-SA license Exact trigonometric values | Wikipedia
List of trigonometric identities | Wikipedia
WEBIn trigonometry, trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables for which both sides of the equality are defined. Geometrically, …
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WEBDefinition. The trigonometric functions sometimes are also called circular functions. They are functions of an angle; they are important when studying triangles, among many other applications.
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WEBBasic Trigonometric Functions | Brilliant Math & Science Wiki. Mei Li, Pi Han Goh, Omkar Kulkarni, and. 6 others. contributed. Trigonometry comes from the two roots, trigonon (or “triangle”) and metria (or “measure”). …
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WEBThe trigonometric functions most widely used in modern mathematics are the sine, the cosine, and the tangent functions. Their reciprocals are respectively the cosecant, the secant, and the cotangent functions, …
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