Hyperbolic functions/R/Introduction/Section

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The hyperbolic functions.


The function defined for by

is called hyperbolic sine.


The function defined for by

is called hyperbolic cosine.
The cosine hyperbolicus (with parameter ) describes a so-called catenary, that is, the curve of a hanging chain.


The functions hyperbolic sine and hyperbolic cosine

have the following properties.

Proof



The function hyperbolic sine is strictly increasing, and the function hyperbolic cosine is strictly decreasing on and strictly increasing on .

See exercise and exercise.



The function

is called hyperbolic tangent.