A message signal is given by m (t) = ^{$\dfrac{1}{2} cos\omega_1 t - \dfrac{1}{2} sin\omega_2 t$}cos sin amplitude-modulated with a carrier of frequency _{^$\omega_0$}to generator s (t) + m (t) [1 + m (t)] cos_{^$\omega_0$}t. What is the power efficiency achieved by this modulation scheme?

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