Trigonometry is a branch of mathematics that deals with triangles, particularly those plane triangles in which one angle has 90 degrees. Trigonometry deals with relationships between sides and angles of triangles using the trigonometric functions.

Trigonometry is used in many fields, including: astronomy, navigation, music theory, acoustics, optics, electronics, probability theory, statistics, biology, chemistry, cryptology, meteorology, oceanography, architecture, economics, engineering, computer graphics, cartography, and game development.

Trigonometry is usually taught in secondary schools either as a separate course or as a part of a precalculus course.

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