E
Editor
Sep 18, 2022
If u=xi+yj, then |u|=
Difficulty: Easy
A:
$x^{2}+y^{2}$
B:
$(x^{2}+y^{2})${2}$
C:
$x^{2}-y^{2}$
D:
$\sqrt{x^{2}+y^{2}}$
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ID: 63273dbaca83163ac3a13217