double
atanh(
double x
)
float
atanhf(
float x
)
)
and
atanhf(
)
functions compute the inverse hyperbolic tangent
of the real
argument
x.
x
)
and
atanhf(
x
)
return +inf, -inf or NaN, and sets the global variable
errno
to EDOM.
)
function appeared in
4.3BSD.