Inverse Hyperbolic Function definition of Inverse Hyperbolic Function in the Free Online Encyclopedia.

inverse hyperbolic function [¦in‚vərs ‚hī·pər‚bäl·ik ′fəŋk·shən]

(mathematics)

An inverse function of a hyperbolic function; that is, an arc-hyperbolic sine, arc-hyperbolic cosine, arc-hyperbolic tangent, arc-hyperbolic cotangent, arc-hyperbolic secant, or arc-hyperbolic cosecant. Also known as antihyperbolic function; arc-hyperbolic function.

Inverse Hyperbolic Function

a function that is the inverse of one of the hyperbolic functions sinh x, cosh x, and tanh x The inverse hyperbolic functions are expressed by the formulas

and are read inverse hyperbolic sine of x, inverse hyperbolic cosine of x, and inverse hyperbolic tangent of x. The derivatives of inverse hyperbolic functions have the form

Therefore, inverse hyperbolic functions often appear upon integration of rational fractions and quadratic irrational expressions.

Inverse hyperbolic functions considered in the complex domain are multiple-valued. Single-valued branches (principal values) are obtained if the principal values of the logarithm are selected in formulas (*); these branches are denoted as arc sinh z, arc cosh z, and arc tanh z. The principal values of the inverse hyperbolic functions are related to the principal values of the inverse trigonometric functions by the formulas

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