Exsecant
Exsecant 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. The exsecant, also abbreviated exsec, is a trigonometric function ... as surveying, astronomy, and spherical trigonometry, the exsecant function is now little-used. Mainly, ...
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