The equation of an $S.H.M.$ with amplitude $A$ and angular frequency $\omega$ in which all the distances are measured from one extreme position and time is taken to be zero at the other extreme position is ...
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(d)
At $t=0$ the distance from $1$ extreme is $2 A$
At $\omega t=\pi$ $x=0$
Hence by resulting values we can get equation for $S.H.M.$. from $S.H.M.$.
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