ATANH(3) BSD Programmer's Manual ATANH(3)
atanh, atanhf - inverse hyperbolic tangent function
#include <math.h> double atanh(double x); float atanhf(float x);
The atanh() and atanhf() functions compute the inverse hyperbolic tangent of the real argument x.
If |x|>=1, atanh(x) and atanhf(x) return +inf, -inf or NaN, and sets the global variable errno to EDOM.
acosh(3), asinh(3), exp(3), math(3)
The atanh() function appeared in 4.3BSD. MirOS BSD #10-current May 6, 1991 1
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