DragonFly On-Line Manual Pages

ATANH(3)	      DragonFly Library Functions Manual	      ATANH(3)

NAME

atanh, atanhf, atanhl -- inverse hyperbolic tangent functions

SYNOPSIS

#include <math.h> double atanh(double x); float atanhf(float x); long double atanhl(long double x);

DESCRIPTION

The atanh() function computes the inverse hyperbolic tangent of the real argument x. The atanhf() function is a single precision version of atanh(). The atanhl() function is an extended precision version of atanh().

RETURN VALUES

If |x|>=1, atanh(x), atanhf(x) and atanhl(x) return +infinity, -infinity or NaN, and set the global variable errno to EDOM.

SEE ALSO

acosh(3), asinh(3), exp(3), infnan(3)

HISTORY

The atanh() function appeared in 4.3BSD. DragonFly 4.3 November 3, 2013 DragonFly 4.3