E
Editor
Sep 18, 2022
The domain of $y=\sqrt{x^{2}-9}$ is
Difficulty: Easy
A:
R
B:
$(0, +\propto)$
C:
$(-\infty, -3) U (3, +\infty)$
D:
$(0, \infty)$
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ID: 63273db8ca83163ac3a103e3