In mathematics, hyperbolic functions are analogs of the ordinary trigonometric, or circular, functions. The basic hyperbolic functions are the hyperbolic sine `sinh` (tʃ or n), and the hyperbolic cosine `cosh` (ʃ), from which are derived the hyperbolic tangent `tanh` (tʃ or n), hyperbolic cosecant `csch` or `cosech` (k or tʃ), hyperb...
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http://en.wikipedia.org/wiki/Hyperbolic_function
a function of an angle expressed as a relationship between the distances from a point on a hyperbola to the origin and to the coordinate axes, as hyperbolic sine or hyperbolic cosine: often expressed as combinations of exponential functions.
Found on
https://www.infoplease.com/dictionary/hyperbolic-function
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