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Hyperbolic Cosine

Calcute implements the hyperbolic cosine function with the cosh function.


It is defined in terms of the exponential function as cosh(x) = (exp(x) + exp(-x)) / 2.

A similarity exists between the trigonometric cosine and the hyperbolic cosine functions. While the former is best described graphically using a unit circle with equation (x2 + y2) = 1, the hyperbolic cosine follows the unit hyperbola with equation (x2 - y2) = 1 instead.

Copyright © Réjean Lefebvre 2004-2011
Delta, British Columbia, Canada