If \( \int_{0}^{\infty} \frac{\sin x}{x} d x=\frac{\pi}{2} \), then...

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If \( \int_{0}^{\infty} \frac{\sin x}{x} d x=\frac{\pi}{2} \), then \( \int_{0}^{\infty} \frac{\sin ^{3} x}{x} d x \) is equal to
P
W
(1) \( \pi / 2 \)
(2) \( \pi / 4 \)
(3) \( \pi / 6 \)
(4) \( 3 \pi / 2 \)
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