cosine

  1. Noun.  (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.
  2. Noun.  (mathematics) The ''x'' coordinate of the point on the unit circle at the given anticlockwise angle from the ''x'' axis.
  3. Noun.  (mathematics) The sum of the real or complex power series.

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This entry was last updated on RefTopia from its source on 3/20/2012.