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Amplitude Modulation - Power

Ask
Consider an angle modulated signal x(t) = 6 cos [2\pi 106t + 2sin(8000\pi t) + 4 cos(8000\pi t)] The average power of x(t) is
(a) 10W
(b) 18W
(c) 20W
(d) 28W

Answer is (b )
Concept
Average power of the signal = $(A_c)^2/2 $
                                              = (6^2)/2
                                              = 36/2
                                              = 18 W

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