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Determine an expression for the instantaneous power

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Determine an expression for the instantaneous power in the circuit, p=iv, as the sum of two cosines

The instantaneous current and voltage in an electric circuit are given by

i = I cos 50*3.14*t

v = V cos (50*3.24* t + 3.14/6)

If I is 3mA and V is 5V, what is the maximum value of p in watts, and the first positive value of t at which it occurs.

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