The voltage source is given by
$$v(t) = 8 + 7\cos(2\pi 70t) + 5\cos(5\pi 70t)$$
The frequencies are 0, $f_1 = 70$ Hz, and $f_2 = 350/2 = 175$ Hz.
The impedance of the inductor is $Z_L = j\omega L$. The impedance of the resistor is $R = 12 \Omega$. The total
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