ACOSH(3) - Linux man page online | Library functions
Inverse hyperbolic cosine function.
Chapter
2017-09-15
ACOSH(3) Linux Programmer's Manual ACOSH(3)
NAME
acosh, acoshf, acoshl - inverse hyperbolic cosine functionSYNOPSIS
#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(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 500 || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE acoshf(), acoshl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCEDESCRIPTION
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.SEE ALSO
asinh(3), atanh(3), cacosh(3), cosh(3), sinh(3), tanh(3)COLOPHON
This page is part of release 4.15 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 https://www.kernel.org/doc/man-pages/.| 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) |