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Given the signal cos(4nt)cos(20nt), determine the impulse response of a filter that outputs a signal proportional to cos(4xt). Can such a filter be found

Given the signal cos(4nt)cos(20nt), determine the impulse response of a filter that outputs a signal proportional to cos(4xt). Can such a filter be found for the signal cos(4nt) cos(20nt) sin(20 st)?

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