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单词 cosine
释义

WordReference Random House Unabridged Dictionary of American English © 2024
co•sine  (kō′sīn),USA pronunciation n. 
  1. Mathematics[Trigonom.]
    • (in a right triangle) the ratio of the side adjacent to a given angle to the hypotenuse.
    • the sine of the complement of a given angle or arc. Abbr.: cos
  2. Mathematics(of a real or complex number x) the function cos x defined by the infinite series 1 - (x2/2!) + (x4/4!) - + …, where ! denotes factorial. Abbr.: cos Cf. sine (def. 3), factorial (def. 1).
  • Neo-Latin cosinus. See co-, sine1
  • 1625–35

Collins Concise English Dictionary © HarperCollins Publishers::
cosine /ˈkəʊˌsaɪn/ n (of an angle)
  1. a trigonometric function that in a right-angled triangle is the ratio of the length of the adjacent side to that of the hypotenuse; the sine of the complement
Etymology: 17th Century: from New Latin cosinus; see co-, sine1
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更新时间：2024/9/22 9:35:37