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ATANH(3)                   Library Functions Manual                   ATANH(3)

NAME
     atanh, atanhf -- inverse hyperbolic tangent function

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <&lt;math.h>&gt;

     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 6.1.5                      May 6, 1991                     NetBSD 6.1.5