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Manual Pages  — ATANH

NAME

atanh, atanhf, atanhl – inverse hyperbolic tangent functions

CONTENTS

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 BSD 4.3, FreeBSD 2.0, and FreeBSD 10.0, respectively.
ATANH (3) June 9, 2013
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