3. If $x, y$ are real numbers, and $\log _{12}\left(x^{2}+3\right)-$ $\log _{12} x y+\log _{12}\left(y^{2}+3\right)=1$, then the ordered pair $(x, y)=$
$3 .(\sqrt{3}, \sqrt{3})$ or
$$
(-\sqrt{3},-\sqrt{3})_{3}
$$