Question: Let x ( t ) be a signal with Nyquist rate 0 . What is the Nyquist rate for the signal y ( t )

Let x(t) be a signal with Nyquist rate 0. What is the Nyquist rate for the signal y(t)=x(t)cos20t?
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Let x ( t ) be a signal with Nyquist rate 0 .

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