cosine
/ˈkəʊ.saɪn/
KƏƱ · saɪn (2 syllables)
English
Noun
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Definition
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
Etymology
From co- + sine, short for complementi sinus in Latin, meaning “sine of the complement”. Doublet of cosinus.
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