NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ATTRIBUTES | SEE ALSO
#include <math.h>double acosh(double x);
The acosh function computes the inverse hyperbolic cosine of the real argument x. For a discussion of errors due to rounding off, see math(3M).
The acosh function returns the inverse hyperbolic cosine of x. If the argument is less than one, acosh sets errno to EDOM and a system-dependent notification is performed.
See attributes(5) for descriptions of the following attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
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Interface Stability | Evolving |
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ATTRIBUTES | SEE ALSO