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atanh(3) [redhat man page]

ATANH(3)						     Linux Programmer's Manual							  ATANH(3)

NAME
atanh - inverse hyperbolic tangent function SYNOPSIS
#include <math.h> double atanh(double x); DESCRIPTION
The atanh() function calculates the inverse hyperbolic tangent of x; that is the value whose hyperbolic tangent is x. If the absolute value of x is greater than 1.0, acosh() returns not-a-number (NaN) and errno is set. ERRORS
EDOM x is out of range. CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899 SEE ALSO
asinh(3), acosh(3), cosh(3), sinh(3), tanh(3) 1993-06-13 ATANH(3)

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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

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