Derive the following identity used in an electrical engineering text3 to represent the
Chapter 9, Problem 9.3.9(choose chapter or problem)
Derive the following identity used in an electrical engineering text3 to represent the received AM signal function. Note that A, c, d are constants and M(t) is a function of time, t. r(t)=(A + M(t)) cos ct + I cos(c + d)t = ((A + M(t)) + I cos dt) cos ct I sin dt sin ct
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