The instantaneous displacement of a simple pendulum oscillator is given by $x = A\cos \left( {\omega t + \frac{\pi }{4}} \right)$. Its speed will be maximum at time
  • A$\frac{\pi }{{4\omega }}$
  • B$\frac{\pi }{{2\omega }}$
  • C$\frac{\pi }{\omega }$
  • D$\frac{{2\pi }}{\omega }$
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