Notations of cosine

In mathematics, the cosine of an angle is the ratio of the length of the adjacent side to the length of the hypotenuse.

Description of this symbol

• Cos in OpenMath
• It seems that cos is not in MathML
• Cos also is described in MathWord and in Wikipedia

Observations of Cos

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Arabic (Saudi Arabia, Egypt, Kuwait and some other provinces)

 In the example on the right we find the cosine function (?) is represented in Arabic context and it is called '? '.
Find the example in page 48 in the math highschool book
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English 

 The English book Calculus with analytic geometry shows cosine function in page 38.
Go directly to the example in google book links

German

 'Kosinusfunktion' symbol is represented in the example on the right, from the German book Mathematischer Begleiter zur Experimentalphysik
page number 50.
Find the example in google books link 

Dutch 

 The Dutch book Continue wiskunde shows the cosine function in page number 43, and it is called 'cosinus' in Dutch context.
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Finnish 

 We find also cosine function in the Finnish book MAOL-taulukot page 25, and it is called 'Kosini' in Finnish context.
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Encoding the observations of cos

See encodings