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hy'perbol'ic func'tion

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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

hyperbolichyperbolic geometry


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