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ATANH(3)                   Library Functions Manual                   ATANH(3)

NAME
     atanh, atanhf, atanhl - inverse hyperbolic tangent function

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.

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

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

STANDARDS
     The atanh() function conforms to ISO/IEC 9899:1999 ("ISO C99").

HISTORY
     The atanh() function appeared in 4.3BSD.

NetBSD 10.99                   January 29, 2013                   NetBSD 10.99