If \( \vec{a}+\vec{b}=\vec{c} \) and \( a+b=c \), then the angle in...

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If \( \vec{a}+\vec{b}=\vec{c} \) and \( a+b=c \), then the angle included
\( P \) between \( \vec{a} \) and \( \vec{b} \) is

W.
(a) \( 90^{\circ} \)
(b) \( 180^{\circ} \)
(c) \( 120^{\circ} \)
(d) zero
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