The voltage across the terminals of a certain circuit and the current entering into its (+) voltage terminal are given by:
v = 4 + 12 Cos[377 t + 60 Degree] - 6 Cos[754 t - 30 Degree]
i = 5 + 10 Cos[377 t + 45 Degree] + 2 Cos[754 t + 15 Degree]
What is the average power?