单词 | cosine |
释义 | cosine /koh"suyn/, n. 1. Trigonom. a. (in a right triangle) the ratio of the side adjacent to a given angle to the hypotenuse. b. the sine of the complement of a given angle or arc. Abbr.: cos 2. Math. (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). [1625-35; < NL cosinus. See CO-, SINE1] |
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