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P-3.2 A signal composed of sinusoids is given by the equation x(t)=10 \cos (800 \pi t+\pi / 4)+7 \cos (1200 \pi t-\pi / 3)-3 \cos (1600 \pi t) (a) Sketch the spectrum of this signal, indicating the complex amplitude of each frequency component. Make separate plots for real/imaginary or magnitude/phase of the complex amplitudes at each frequency.

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