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FreeBSD 11.0 - man page for atanhl (freebsd section 3)

ATANH(3)						   BSD Library Functions Manual 						  ATANH(3)

NAME
atanh, atanhf, atanhl -- inverse hyperbolic tangent functions
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h> double atanh(double x); float atanhf(float x); long double atanhl(long double x);
DESCRIPTION
The atanh(), atanhf(), and atanhl() functions compute the inverse hyperbolic tangent of the real argument x. For a discussion of error due to roundoff, see math(3).
RETURN VALUES
These functions return the inverse hyperbolic tangent of x if successful. If the argument has absolute value 1, a divide-by-zero exception is raised and an infinity is returned. If |x| > 1, an invalid exception is raised and an NaN is returned.
SEE ALSO
acosh(3), asinh(3), exp(3), fenv(3), math(3)
HISTORY
The atanh(), atanhf(), and atanhl() functions appeared in 4.3BSD, FreeBSD 2.0, and FreeBSD 10.0, respectively.
BSD
June 9, 2013 BSD