Question: The voltage and current through an element are, respectively, V(t) = 30 cos(t + 25) + 10 cos(2t + 35) + 4 cos(3t - 10)

The voltage and current through an element are, respectively,
V(t) = 30 cos(t + 25°) + 10 cos(2t + 35°)
+ 4 cos(3t - 10°) V
I(t) = 2 cos t + cos (2t + 10°) A
(a) Find the average power delivered to the element.
(b) Plot the power spectrum.

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