The potential energy of a particle of mass \( 1 \mathrm{~kg} \) in motion along the \( x \)-axis...
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The potential energy of a particle of mass \( 1 \mathrm{~kg} \) in motion along the \( x \)-axis is given by
\[
U=4(1-\cos 2 x) \mathrm{J}
\]
Here, \( x \) is in metres. Find the period of small oscillations.
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