Modern Math Acosh

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Acosh

Returns the inverse hyperbolic cosine of a number of 1 or more.

Syntax

Acosh( x )

Notes

• Below 1 the result is NaN.
• The inverse of Cosh.
• Overloaded on float64 and on float32: a single-precision argument takes the single-precision path and does not widen.
• BOUNDED accuracy: correct to the platform library's stated ulp bound.

Examples

#import "std/numeric"
using numeric

print Acosh( 2.0 )           '' 1.316957896924817
print Acosh( 0.5 )           '' 1.#QNAN

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Library: Math Library
Category: Math Library
Documented under: The libm surface