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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)
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