The carrier frequency of the W-OSU channel is 0.82 MHz. If the upper sideband of the AM signal has frequency components of amplitude 0.4 at 0.825 MHz, 0.2 at 0.83 MHz, and 0.25 at 0.84 MHz,
a. Find an expression for the modulating signal.
b. Plot the spectrum of the modulating signal.
c. Plot the spectrum of the AM signal including the lower sideband.
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