To the west is Borneo. To the north are the Philippines. To the south is Flores. To the southeast is Timor. To the east are the Moluccas.
See also Lindu.
... + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...