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4.4-6 In a QAM system (Fig. 4.17), the locally generated carrier has a frequency error Aw and a phase error S; that is, the receiver carrier is cos [(We + Aw)t + 8] or sin [(wc + Aw)t + 8]. Show that the output of the upper receiver branch is m1 (t) cos [(Aw)t + 8] - m2(t) sin [(Aw)t+ 8] instead of m1 (t), and the output of the lower receiver branch is m1 (t) sin [(Aw)t + 8] + m2(t) cos [(Aw)t+ 8] instead of m2 (t)