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Question

Suppose the maximum frequency in a band-limited signal x(t) is 5 kHz Then the maximum frequency in x(t) $cos (2000 π t)$ , in kHz, is

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Solution

Maximum possible frequency of x(t) $(2000 π)$
$= (f_{1} + f_{2})$
$= 5 kHz + 1 k Hz = 6 kHz$

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