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词汇 Excsc
分类 英语词汇 英语翻译词典
释义

Excsc

英语百科

Exsecant

(重定向自Excsc)
A unit circle with trigonometric functions.
The trigonometric functions, including the exsecant, can be constructed geometrically in terms of a unit circle centered at O.  The exsecant is the portion DE of the secant exterior to (ex) the circle.
exsecant (blue) and excosecant (green)

The exsecant (exsec, exs) and excosecant (excosec, excsc, exc) are trigonometric functions defined in terms of the secant and cosecant functions. They were important in fields such as surveying, railway engineering, civil engineering, astronomy, and spherical trigonometry and could help improve accuracy, but are rarely used today except to simplify some calculations.

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