Out of the following functions representing motion of a particle wh...

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Out of the following functions representing motion of a particle which represents \( \mathrm{SHM} \)
(1) \( y=\sin \omega t-\cos \omega t \)
(2) \( y=\sin ^{3} \omega t \)
\( \mathrm{P} \)
(3) \( y=5 \cos [3 \pi / 4-3 \omega t] \)
(4) \( y=1+\omega t+\omega^{2} t^{2} \)
W
(a) Only (1) and (2)
[CBSE PMT (Pre.) 2011]
(b) Only (1)
(c) Only (4) does not represent SHM
(d) Only (1) and (3)
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