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Out of the following functions representing motion of a particle which represents SHM
\( \mathrm{P} \)
(i) \( y=\sin \omega t-\cos \omega t \)
W
(ii) \( y=\sin ^{3} \omega t \)
(iii) \( y=5 \cos \left(\frac{3 \pi}{4}-3 \omega t\right) \)
(iv) \( y=1+\omega t+\omega^{2} t^{2} \)
(1) Only (i)
(2) Only (iv) does not represent SHM
(3) Only (i) and (iii)
(4) Only (i) and (ii)
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