Definition of cosine in English:

cosine

Syllabification: co·sine
Pronunciation: /ˈkōˌsīn
 
/

noun

Mathematics
  • The trigonometric function that is equal to the ratio of the side adjacent to an acute angle (in a right-angled triangle) to the hypotenuse.
    More example sentences
    • If the two angles are the same we get the sines and cosines of double the angle.
    • In fact, it corresponds to the graph of a function called the hyperbolic cosine.
    • I can remember roughly how to differentiate a standard xy formula but sines, cosines and tangents are a mystery.

More definitions of cosine

Definition of cosine in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day skosh
Pronunciation: skəʊʃ
noun
a small amount; a little