EnglishEdit

 
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Cosine function

EtymologyEdit

co- +‎ sine, short for complementi sinus in Latin, meaning “sine of the complement”.

PronunciationEdit

NounEdit

cosine (plural cosines)

  1. (trigonometry) In a right triangle, the ratio of the length of the side adjacent to an acute angle to the length of the hypotenuse. Symbol: cos

Usage notesEdit

In various branches of mathematics, the cosine of an angle is determined in various ways, including the following:

  • The x-coordinate of the point on the unit circle at the given anticlockwise angle from the x-axis.
  • The sum of the real or complex power series

          

    where x is in radians.

Related termsEdit

TranslationsEdit

See alsoEdit

AnagramsEdit


ItalianEdit

NounEdit

cosine f

  1. plural of cosina

AnagramsEdit


Old FrenchEdit

NounEdit

cosine f (oblique plural cosines, nominative singular cosine, nominative plural cosines)

  1. (female) cousin

DeclensionEdit

DescendantsEdit

  • French: cousine