• (British) enPR: kō'sīn, IPA: /ˈkəʊ.saɪn/
  • (America) enPR: kō'sīn, IPA: /ˈkoʊ.saɪn/

cosine (plural cosines)

  1. (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
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