GNU/Linux |
CentOS 4.8 |
i386 |
acoshf(3) |
acosh, acoshf, acoshl − inverse hyperbolic cosine function
#include <math.h>
double acosh(double x);
float acoshf(float x);
long double acoshl(long double x);
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)
acoshf(3) |