If \( \vec{a} \) and \( \vec{b} \) are unit vectors such that \( |\...
If \( \vec{a} \) and \( \vec{b} \) are unit vectors such that \( |\vec{a}+\vec{b}|=1 \),
\( \mathrm{P} \) then \( |2 \vec{a}-3 \vec{b}|= \)
W
(1) 19
(2) \( \sqrt{19} \)
(3) \( \sqrt{13} \)
(4) 40
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