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In the $P^{\text{th}}$ second,a particle describes an angular displacement of $\beta \text{ rad}$. If it starts from rest,the angular acceleration is:
- A$\frac{\beta}{P}$
- B$\frac{\beta}{(P-1)}$
- C$\frac{2 \beta}{(2 P-1)}$
- D$\frac{(2 \beta+1)}{(2 P-1)}$
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