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Which of the following is not simple harmonic
\( \mathrm{P} \) function?

W)
(1) \( y=a \sin 2 \omega t+b \cos ^{2} \omega t \)
(2) \( y=a \sin \omega t+b \cos 2 \omega t \)
(3) \( y=1-2 \sin ^{2} \omega t \)
(4) \( y=\left(\sqrt{a^{2}+b^{2}}\right) \sin \omega t \cos \omega t \)
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