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A particle moves on a circular path of radius \( R \).
Find magnitude of its displacement during an
\( \mathrm{P} \) interval in which it covers angular displacement \( \theta \).
(1) \( R \theta \)
(2) \( R \sin \theta \)
-(3) \( 2 R \cos \frac{\theta}{2} \)
(4) \( 2 \mathrm{R} \sin \frac{\theta}{2} \)
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