The mass of a particle is $1\,\,kg$ and it is moving along  $x-$ axis. The period of its small oscillation is $\frac {\pi }{2}$ . Its potential energy may be
  • A$-4\,\,sin\,2x$
  • B$-16\,\,sin\,x$
  • C$-16\,\,cos\,x$
  • D$-4\,\,cos\,\,2x$
Diffcult
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