tail head cat sleep
QR code linking to this page

Manual Pages  — ACOSH

NAME

acosh, acoshf, acoshl – inverse hyperbolic cosine functions

CONTENTS

LIBRARY

Math Library (libm, -lm)

SYNOPSIS

#include <math.h>

double
acosh(double x);

float
acoshf(float x);

long double
acoshl(long double x);

DESCRIPTION

The acosh(), acoshf(), and acoshl() functions compute the inverse hyperbolic cosine of the real argument x. For a discussion of error due to roundoff, see math(3).

RETURN VALUES

These functions return the inverse hyperbolic cosine of x. If the argument is less than 1, acosh() raises an invalid exception and returns an NaN.

SEE ALSO

asinh(3), atanh(3), exp(3), fenv(3), math(3)

HISTORY

The acosh(), acoshf(), and acoshl() functions appeared in BSD 4.3, FreeBSD 2.0, and FreeBSD 10.0, respectively.

ACOSH (3) June 9, 2013

tail head cat sleep
QR code linking to this page


Please direct any comments about this manual page service to Ben Bullock. Privacy policy.

Ken Thompson was once asked by a reporter what he would have changed about Unix if he had it all to do over again. His answer: “I would spell creat with an ‘e.'”