If the sum of two unit vectors is a unit vector, then P magnitude o...

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If the sum of two unit vectors is a unit vector, then
P magnitude of difference is

W
(1) \( \sqrt{2} \)
(2) \( \sqrt{3} \)
(3) \( \frac{1}{\sqrt{2}} \)
(4) \( \sqrt{5} \)
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