cosine
[kohsahyn]

noun
Trigonometry.
 (in a right triangle) the ratio of the side adjacent to a given angle to the hypotenuse.
 the sine of the complement of a given angle or arc. Abbreviation: cos
Mathematics. (of a real or complex number x) the function cos x defined by the infinite series 1 − (x2/2!) + (x4/4!) − + …, where ! denotes factorial. Abbreviation: cosCompare sine(def 3), factorial(def 1).
Origin of cosine
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Examples from the Web for cosine
Historical Examples of cosine
Like the functions sine and cosine, the elliptic functions have addition theorems, e.g.
The New Gresham EncyclopediaVarious
And, seating himself beside Dirrik, he began to explain the mysteries of sine, cosine and tangent.
Dry Fish and WetAnthon Bernhard Elias Nilsen
These are then respectively the sine and cosine of the angle α between the radius and one of the axes (O X).
The inventions, researches and writings of Nikola TeslaThomas Commerford Martin
Multiply this by the cosine of the angle and divide by the sine, and we shall get the value of the arc QY for the equator.
Outlines of a Mechanical Theory of StormsT. Bassnett
Nevertheless, I bear no grudge against the sine and the cosine, which I continue to hold in high esteem.
The Life of the FlyJ. Henri Fabre
cosine
noun (of an angle)
Word Origin for cosine
C17: from New Latin cosinus; see co, sine 1
Collins English Dictionary  Complete & Unabridged 2012 Digital Edition
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Online Etymology Dictionary, © 2010 Douglas Harper
cosine
[kō′sīn′]
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.