Cosine

English

Cosine function

Etymology

From Template:Pre, short for Template:M in Latin, meaning “sine of the complement”. Template:Dbt.

Pronunciation

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Noun

1. Template:Lb 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.
• The sum of the real or complex power series
  
       $\sum _{n=0}^{\mathrm{\infty }}\frac{(-1{)}^n{x}^{2n}}{(2n)!}=1-\frac{x^2}{2}+\frac{x^4}{24}-\frac{x^6}{720}+\frac{x^8}{40320}-\cdots$
  
  where x is in radians.

Related terms

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Translations

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Anagrams

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Italian

Noun

1. Template:Plural of

Anagrams

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Old French

Noun

1. (female) cousin

Declension

• see Template:M

Descendants

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