ATANH(3) | FreeBSD Library Functions Manual | ATANH(3) |
NAME
atanh, atanhf, atanhl — inverse hyperbolic tangent functionsLIBRARY
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. For a discussion of error due to roundoff, see math(3).RETURN VALUES
These functions return the inverse hyperbolic tangent of x if successful. If the argument has absolute value 1, a divide-by-zero exception is raised and an infinity is returned. If |x| > 1, an invalid exception is raised and an NaN is returned.HISTORY
The atanh(), atanhf(), and atanhl() functions appeared in 4.3BSD, FreeBSD 2.0, and FreeBSD 10.0, respectively.June 9, 2013 | FreeBSD |