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/
- (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
Categories:
- English terms prefixed with co-
- English doublets
- English 2-syllable words
- English terms with IPA pronunciation
- English terms with audio links
- Rhymes:English/əʊsaɪn
- Rhymes:English/əʊsaɪn/2 syllables
- Rhymes:English/oʊsaɪn
- Rhymes:English/oʊsaɪn/2 syllables
- English terms with homophones
- English lemmas
- English nouns
- English countable nouns
- en:Trigonometry
- en:Functions
- en:Trigonometric functions
- Italian non-lemma forms
- Italian noun forms
- Old French lemmas
- Old French nouns
- Old French feminine nouns