If \( \vec{a} \) and \( \vec{b} \) are unit vector, then the greate...

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If \( \vec{a} \) and \( \vec{b} \) are unit vector, then the greatest value of
P
W \( |\vec{a}+\vec{b}|+|\vec{a}-\vec{b}| \), is
(1) 2
(2) 4
(3) \( 2 \sqrt{ } 2 \)
(4) \( \sqrt{ } 2 \)
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