atanh(3) [netbsd man page]

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

NAME

     atanh, atanhf -- inverse hyperbolic tangent function

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     double
     atanh(double x);

     float
     atanhf(float x);

DESCRIPTION

     The atanh() and atanhf() functions compute the inverse hyperbolic tangent of the real argument x.

RETURN VALUES

     If |x|>=1, atanh(x) and atanhf(x) return +inf, -inf or NaN, and sets the global variable errno to EDOM.

SEE ALSO

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

HISTORY

     The atanh() function appeared in 4.3BSD.

BSD
								    May 6, 1991 							       BSD

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