The potential energy of a particle of mass $1\, kg$ in motion along the $x-$ axis is given by $U = 4\,(1 -cos\,2x)$, where $x$ is in $metres$ . The period of small oscillation (in $second$ ) is
  • A$2\pi $
  • B$\pi $
  • C$\frac{\pi }{2}$
  • D$\sqrt 2 \pi $
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