cosine

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English

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English Wikipedia has an article on:
Wikipedia
Cosine function

Etymology

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

Pronunciation

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Noun

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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 notes

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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.

Derived terms

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Translations

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See also

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Anagrams

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Italian

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Noun

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cosine f

  1. plural of cosina

Anagrams

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Old French

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Noun

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

  1. (female) cousin

Declension

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Descendants

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  • French: cousine