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Question: no need to draw a vector diagram only use the...

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PROBLEM: Each of the following signals may be simplified, and expressed as a single sinusoid of the form A cos(or + φ). For each signal, draw a vector diagram of the complex amplitudes (phasors), and use vector addition to estimate the amplitude A and phase φ of the sinusoid. Then use the phasor addition theorem to find the exact values for A and φ. (a) xa(t) = 3 cos(388mt-4T/3) + cos(388m t + 3T/4)

No need to draw a vector diagram, only use the phaser addition theorem. Thank you
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