c $\begin{array}{l}
y = A\,\cos \,\omega t\,\cos \,2\omega t + A\,\sin \,\omega t\,\sin \,2\omega t\\
\,\,\,\,\, = A\,\cos \,\left( {2\omega t - \omega t} \right) = A\,\cos \,\omega t
\end{array}$
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