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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 argu-
     ment 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
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