Originální popis anglicky:
acosh, acoshf, acoshl - inverse hyperbolic cosine function
Návod, kniha: Linux Programmer's Manual
#include <math.h>
double acosh(double x);
float acoshf(float x);
long double acoshl(long double x);
Link with -lm.
The
acosh() function calculates the inverse hyperbolic cosine of
x; that is the value whose hyperbolic cosine is
x. If
x
is less than 1.0,
acosh() returns not-a-number (NaN) and
errno
is set.
- EDOM
- x is out of range.
SVID 3, POSIX, BSD 4.3, ISO 9899. The float and long double variants are C99
requirements.
asinh(3),
atanh(3),
cosh(3),
sinh(3),
tanh(3)