The instantaneous displacement of a simple pendulum oscillator is g...

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The instantaneous displacement of a simple pendulum oscillator is given by \( x=A \cos (\omega t+\pi / 4) \). Its speed will be maximum at time
[CPMT 2000]
\( \mathrm{P} \)
(a) \( \frac{\pi}{4 \omega} \)
(b) \( \frac{\pi}{2 \omega} \)
(c) \( \frac{\pi}{\omega} \)
(d) \( \frac{2 \pi}{\omega} \)
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