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Question: a real signal zt has the following twosided spectrum 10...

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A real signal z(t) has the following two-sided spectrum: 1.0 0.5ej/2 0.5e-/2 0.3e-jT/5 0.3e/5 600π 300 π 0 300π - 600π (a) Write an equation for (t) as a sum of cosines (b) Plot the spectrum of the signal y(t) = 2r(t) + 10cos(250m(t-0.002)).

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