If the sum of two unit vector is a unit vector, then
\( \mathrm{P} ...
If the sum of two unit vector is a unit vector, then
\( \mathrm{P} \) the magnitude of their difference is:
W
(1) 1
(2) \( \sqrt{7} \)
(3) \( \sqrt{5} \)
(4) \( \sqrt{3} \)
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