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Cosine

//ˈkoʊ.saɪn// noun

Definitions

Noun
  1. 1
    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
  2. 2
    ratio of the adjacent side to the hypotenuse of a right-angled triangle wordnet

Etymology

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

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