Table of Contentsatanh - inverse hyperbolic tangent function #include <math.h>
double atanh(double x); The atanh() function calculates the inverse hyperbolic tangent of x; that is the value whose hyperbolic tangent is x. If the absolute value of x is greater than 1.0, acosh() returns not-a-number (NaN) and errno is set. - EDOM
- x is out of range.
SVID 3, POSIX, BSD 4.3, ISO 9899 asinh(3), acosh(3), cosh(3), sinh(3), tanh(3)
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