Power in AM signal

Electricity and Magnetism Level pending

An AM signal has the form $u(t) = [20 + 2 \cos{ 3000 \pi t} + 10 \cos{6000 \pi t}]\cos{2 \pi f_{c} t},$ where $$f_{c} = 10^{5} \text{ Hz.}$$ Find the power in the side bands.

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