| ACOSH(3) | Library Functions Manual | ACOSH(3) | 
acosh, acoshf,
  acoshl —
#include <math.h>
double
  
  acosh(double
    x);
float
  
  acoshf(float
    x);
long double
  
  acoshl(long
    double x);
acosh(), acoshf(), and
  acoshl() functions compute the inverse hyperbolic
  cosine of the real argument x.
acosh(x),
  acoshf(x), and
  acoshl(x) return NaN and set the
  global variable errno to EDOM.
acosh() function conforms to
  ISO/IEC 9899:1999 (“ISO C99”).
acosh() function appeared in
  4.3BSD.
| January 29, 2013 | NetBSD 10.0 |