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Exercise For each of the following signals, using appropriate trigonometric identities, consider whether it is periodic or not, and if so, calculate its period: The

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Exercise For each of the following signals, using appropriate trigonometric identities, consider whether it is periodic or not, and if so, calculate its period: The signal x4(t)=27cos3(2f1t)+sin2(2f2t),f2=2f1

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