.I y
is positive infinity (negative infinity) and
.I x
-is negative infinity, +3*pi/4 (-3*pi/4) is returned.
+is negative infinity, +3*pi/4 (\-3*pi/4) is returned.
If
.I y
is positive infinity (negative infinity) and
.I x
-is positive infinity, +pi/4 (-pi/4) is returned.
+is positive infinity, +pi/4 (\-pi/4) is returned.
.\"
.\" POSIX.1 says:
.\" If both arguments are 0, a domain error shall not occur.