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Man Pages
ATANH(3) FreeBSD Library Functions Manual ATANH(3)

atanh, atanhf, atanhl
inverse hyperbolic tangent functions

Math Library (libm, -lm)

#include <math.h>

double
atanh(double x);

float
atanhf(float x);

long double
atanhl(long double x);

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).

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.

acosh(3), asinh(3), exp(3), fenv(3), math(3)

The atanh(), atanhf(), and atanhl() functions appeared in 4.3BSD, FreeBSD 2.0, and FreeBSD 10.0, respectively.
June 9, 2013 FreeBSD 13.1-RELEASE

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