A particle starts from a point $P$ at a distance of $A/2$ from the mean position $O\, \&$ travels towards left as shown in the figure. If the time period of $SHM,$ executed about $O$ is $T$ and amplitude $A$ then the equation of motion of particle is :
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$X=A \cos \left(\omega t+60^{\circ}\right)$
$=A \cos \left(\frac{2 \pi}{T} t+\frac{\pi}{3}\right)$
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