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e = e`cosωct ………. 1
e`= Ec + MEc cosωst …………2
e = (Ec + MEc cosωst )cosωct ………….3
= Ec cosωct + MEc cosωst cosωct
= Ec cosωct + MEc/2 2cosωct cosωst [ 2cosA+cosB = cos(A+B)+cos(A-B]
= Ec cosωct + MEc/2 cos(ωc+ωs)t+MEc/2 cos(ωc-ωs)t
= Ec cos2πfct+ MEc/2 cos2π(fC+fL)t MEc/2 Cos2π(fC-fL)t
