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ACOSH(3) BSD Library Functions Manual ACOSH(3)
NAME
acosh -- inverse hyperbolic cosine function
SYNOPSIS
#include <math.h>
double
acosh(double x);
DESCRIPTION
The acosh() function computes the inverse hyperbolic cosine of the real argument x.
SPECIAL VALUES
acosh(1) returns +0.
acosh(x) returns a NAN and raises the "invalid" floating-point exception for x < 1.
acosh(+infinity) returns +infinity.
SEE ALSO
asinh(3), atanh(3), exp(3), infnan(3), math(3), matherr(3)
STANDARDS
The acosh() function conforms to ISO/IEC 9899:1999(E).
HISTORY
The acosh() function appeared in 4.3BSD.
4.3 Berkeley Distribution November 15, 2002 4.3 Berkeley Distribution |
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