ACOSH, ACOSHF, ACOSHL - reference manual online

Inverse hyperbolic cosine function.

ACOSH(3)                            Linux Programmer's Manual                            ACOSH(3)

NAME acosh, acoshf, acoshl - inverse hyperbolic cosine function
SYNOPSIS #include <math.h> double acosh(double x); float acoshf(float x); long double acoshl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): acosh(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99 acoshf(), acoshl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99
DESCRIPTION These functions calculate the inverse hyperbolic cosine of x; that is the value whose hyperbolic cosine is x.
RETURN VALUE On success, these functions return the inverse hyperbolic cosine of x. If x is a NaN, a NaN is returned. If x is +1, +0 is returned. If x is positive infinity, positive infinity is returned. If x is less than 1, a domain error occurs, and the functions return a NaN.
ERRORS See math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Domain error: x is less than 1 errno is set to EDOM. An invalid floating-point exception (FE_INVALID) is raised.
ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌─────────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├─────────────────────────────┼───────────────┼─────────┤ │acosh(), acoshf(), acoshl() │ Thread safety │ MT-Safe │ └─────────────────────────────┴───────────────┴─────────┘
CONFORMING TO C99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD, C89.
SEE ALSO asinh(3), atanh(3), cacosh(3), cosh(3), sinh(3), tanh(3)
COLOPHON This page is part of release 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at
2015-04-19 ACOSH(3)
This manual Reference Other manuals
acosh(3) referred by asinh(3) | atanh(3) | cacosh(3) | cosh(3) | sinh(3) | tanh(3)
refer to asinh(3) | atanh(3) | attributes(7) | cacosh(3) | cosh(3) | feature_test_macros(7) | math_error(7) | sinh(3) | tanh(3)