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    Plotting the Spectrum of a Sampled Signal

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    Plot the spectrum of the sampled signal. See attached file for full problem description.

    The signal x(t) = 3 + 4cos(10πt) + 5cos(14πt) + 2cos(20πt) is sampled at a rate of 30 samples per second. Plot the spectrum of the sampled signal showing all components for │f │< 80. Could you please explain how x(t) can be reconstructed from the samples?

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