If \( \vec{P} \cdot \vec{Q}=P Q \), then angle between \( \vec{P} \...

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If \( \vec{P} \cdot \vec{Q}=P Q \), then angle between \( \vec{P} \) and \( \vec{Q} \) is
\( \mathrm{P} \)
(A) \( 0^{\circ} \)
(B) \( 30^{\circ} \)
(C) \( 45^{\circ} \)
(D) \( 60^{\circ} \)
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