Which of the following equation does not represent a simple harmonic motion
A$y = a\sin \omega \,t$
B$y = a\cos \omega \,t$
C$y = a\sin \omega \,t + b\cos \omega \,t$
D$y = a\tan \omega \,t$
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D$y = a\tan \omega \,t$
d (d) Standard equation of $S.H.M.$ $\frac{{{d^2}y}}{{d{t^2}}} = \, - \,{\omega ^2}y,$ is not satisfied by $y = a\tan \omega \,t$.
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