ATANH(3) BSD Library Functions Manual ATANH(3)NAMEatanh — inverse hyperbolic tangent function
SYNOPSIS
#include <math.h>
double
atanh(double x);
DESCRIPTION
The atanh() function computes the inverse hyperbolic tangent of the real
argument x. For a discussion of error due to roundoff, see math(3).
RETURN VALUES
The atanh() function returns the inverse hyperbolic tangent of x if suc‐
cessful. On the VAX and Tahoe, if the argument has absolute value bigger
than or equal to 1, atanh() sets the global variable errno to EDOM and a
reserved operand fault is generated.
SEE ALSOacosh(3), asinh(3), exp(3), infnan(3)math(3),
HISTORY
The atanh() function appeared in 4.3BSD.
4.3 Berkeley Distribution June 4, 1993 4.3 Berkeley Distribution