Editor
The unit vector of a vector $\overrightarrow{A}$ of magnitude 2 is:
Difficulty: Hard
A: 
$2\overrightarrow{A}$
B: 
$2+\overrightarrow{A}$
C: 
$\frac{\overrightarrow{A}}{2}$
D: 
$2-\overrightarrow{A}$
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