double
acos(
double x
)
float
acosf(
float x
)
)
and
acosf(
)
functions compute the principal value of the arc cosine of
x
in the range
[0],.
x
)
and
acosf(
x
)
set the global variable
errno
to EDOM.
)
function conforms to
ANSI X3.159-1989 (``ANSI C89'') .