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Exsecant : ウィキペディア英語版
Exsecant
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 for to simplify some calculations.
==Exsecant==

The exsecant,〔trigonometric function defined in terms of the secant function sec(θ):〔〔〔
:\operatorname(\theta) = \sec(\theta) - 1 = \frac - 1. \,〔〔〔
The name ''exsecant'' can be understood from a graphical construction of the various trigonometric functions from a unit circle, such as was used historically. sec(θ) is the secant line \overline, and the exsecant is the portion \overline of this secant that lies ''exterior'' to the circle (''ex'' is Latin for ''out of'').

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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