cosine
English edit
Etymology edit
co- + sine, short for complementi sinus in Latin, meaning “sine of the complement”. Doublet of cosinus.
Pronunciation edit
- (UK) IPA(key): /ˈkəʊ.saɪn/
- (US) IPA(key): /ˈkoʊ.saɪn/
Audio (US) (file)
- (General Australian) IPA(key): /ˈkəʉ.sɑɪn/
- Rhymes: -əʊsaɪn, -oʊsaɪn
- Homophone: cosign
Noun edit
cosine (plural cosines)
- (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 edit
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 edit
Related terms edit
Translations edit
trigonometric function
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See also edit
Anagrams edit
Italian edit
Noun edit
cosine f
Anagrams edit
Old French edit
Noun edit
cosine oblique singular, f (oblique plural cosines, nominative singular cosine, nominative plural cosines)
- (female) cousin
Declension edit
- see cosin
Descendants edit
- French: cousine