The periodic function \( f(t)=A \sin \omega t \) repeats itself after (a) \( 2 \pi \) (b) \( 3 \...

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The periodic function \( f(t)=A \sin \omega t \) repeats itself after
(a) \( 2 \pi \)
(b) \( 3 \pi \)
(c) \( \pi \)
(d) \( \pi / 2 \)
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