Editor
Editor
 Sep 18, 2022
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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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