| ATANH(3) | Library Functions Manual | ATANH(3) | 
atanh, atanhf,
  atanhl —
#include <math.h>
double
  
  atanh(double
    x);
float
  
  atanhf(float
    x);
long double
  
  atanhl(long
    double x);
atanh(), atanhf(), and
  atanhl() functions compute the inverse hyperbolic
  tangent of the real argument x.
atanh(x),
  atanhf(x), and
  atanhl(x) return +inf, -inf or
  NaN, and sets the global variable errno to
  EDOM.
atanh() function conforms to
  ISO/IEC 9899:1999 (“ISO C99”).
atanh() function appeared in
  4.3BSD.
| January 29, 2013 | NetBSD 10.0 |