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hyperbolic functions
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hyperbolic functions

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Also known as: hyperbolic trigonometric function
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Also called:
hyperbolic trigonometric functions
Key People:
Johann Heinrich Lambert
Related Topics:
function
hyperbola
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hyperbolic functions, the hyperbolic sine of z (written sinh z); the hyperbolic cosine of z (cosh z); the hyperbolic tangent of z (tanh z); and the hyperbolic cosecant, secant, and cotangent of z. These functions are most conveniently defined in terms of the exponential function, with sinh z = 1/2(ez − e−z) and cosh z = 1/2(ez + e−z) and with the other hyperbolic trigonometric functions defined in a manner analogous to ordinary trigonometry. Just as the ordinary sine and cosine functions trace (or parameterize) a circle, so the sinh and cosh parameterize a hyperbola—hence the hyperbolic appellation. Hyperbolic functions ...(100 of 161 words)

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