atanh(3) - NetBSD Manual Pages

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ATANH(3)                NetBSD 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.

NetBSD 6.0                        May 6, 1991                       NetBSD 6.0