3. Determine whether or not the following signals are periodic. If a signal is periodic, determi

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3. Determine whether or not the following signals are periodic. If a signal is periodic, determine its fundamental period. (a) $x_1(t) = \sin(0.25\pi t) + \cos(0.3\pi t) + \sin(0.4\pi t)$ (b) $x_2(t) = 2 \cdot \cos(6\pi t) \cdot \cos(4\pi t) + \sin(\frac{\pi}{3}t)$