atanh(3) - NetBSD Manual Pages

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ATANH(3)                NetBSD 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 hyper- bolic 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 7.0 January 29, 2013 NetBSD 7.0
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