Editor
Editor
 Sep 18, 2022
0
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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NETNUST Entry TestMathematicsFunctions and Limits