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Consider the signal $$x(t)= \begin{cases}2\cos (t)+ \cos(2t) & t < 0\\2\sin (t)+ \sin(2t) & t \geq 0\end{cases}$$
The signal X(t) is:
periodic with period = $$2\pi$$
periodic with period =$$\pi$$
non-periodic
periodic with period = $$\frac{\pi}{2}$$
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