If the angle \( \alpha \) between two forces of equal magnitude is reduced to \( (\alpha-\pi / 3...

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If the angle \( \alpha \) between two forces of equal magnitude is reduced to \( (\alpha-\pi / 3) \), then the magnitude of their resultant becomes \( \sqrt{3} \) times of the earlier one. The angle \( \alpha \) is
(A) \( \pi / 2 \)
(B) \( 2 \pi / 3 \)
(C) \( \pi / 4 \)
(D) \( 4 \pi / 5 \)
\( \mathrm{P} \)
\( \mathrm{W} \)
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