
1) Circular function 2) Cosec 3) Reciprocal in trigonometry 4) Trigonometric function
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1) Cosec
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https://www.crosswordclues.com/clue/cosecant

• (n.) The secant of the complement of an arc or angle. See Illust. of Functions.
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(from the article `trigonometry`) ...to calculations. There are six functions of an angle commonly used in trigonometry. Their names and abbreviations are sine (sin), cosine (cos), ...
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http://www.britannica.com/eb/a-z/c/146
Co·se'cant noun [ For
co. secans , an abbrev. of Latin
complementi secans .]
(Trig.) The secant of the complement of an arc or angle. See
Illust. of
Functions .
Found on
http://www.encyclo.co.uk/webster/C/167

[
n] - ratio of the hypotenuse to the opposite side of a right-angled triangle
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http://www.webdictionary.co.uk/definition.php?query=cosecant

Note: In this series A is in radians and See also: Cosine, Cotangent, Secant, Series Expansions, Sine, Tangent.
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cosec noun ratio of the hypotenuse to the opposite side of a right-angled triangle
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https://www.encyclo.co.uk/local/20974

(in a right triangle) the ratio of the hypotenuse to the side opposite a given angle. · the secant of the complement, or the reciprocal of the sine, of a given angle or arc. Abbr.: csc&hasp;
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https://www.infoplease.com/dictionary/cosecant
No exact match found.