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co-sine

 - 2 dictionary results

co⋅sine

  [koh-sahyn]
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–noun
1. Trigonometry.
a. (in a right triangle) the ratio of the side adjacent to a given angle to the hypotenuse.
b. the sine of the complement of a given angle or arc. Abbreviation: cos
2. 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: cos Compare sine (def. 3), factorial (def. 1).
Origin:
1625–35; < NL cosinus. See co-, sine1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Science Dictionary
cosine   (kō'sīn')  Pronunciation Key 

  1. The ratio of the length of the side adjacent to an acute angle of a right triangle to the length of the hypotenuse.

  2. The abscissa of the endpoint of an arc of a unit circle centered at the origin of a Cartesian coordinate system, the arc being of length x and measured counterclockwise from the point (1, 0) if x is positive or clockwise if x is negative.

  3. A function of a number x, equal to the cosine of an angle whose measure in radians is equal to x.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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