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Cosine - What does it mean?

cosine | |

cosine

English

(wikipedia cosine)

Noun

(en 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

    • Usage notes

    In various branches of mathematics, the cosine of an angle is determined in various ways, including the following: * The x''-coordinate]] of the point on the unit circle at the given anticlockwise angle from the [[x-axis, ''x -axis. * The sum of the real or complex power series

         \sum_{n=0}^\infty \frac{(-1)^n x^{2n}}{(2n)!} = 1 - {x^2 \over 2} + {x^4 \over 24} - {x^6 \over 720} + {x^8 \over 40320} - \cdots

    where x is in radians.

    Related terms

    * arccosine * sine

    See also

    * power series * secant * tangent * trigonometry

    Anagrams

    * * ----

    Not English

    has no English definition. It may be misspelled.