C14: Analyze the circuit of Fig. 10, and prove that Eq. (9) holds. Hint: You can gain additional insight by directing LTSpice to plot also vo the waveform right at the op amp's output pin. C15: By summing a signal with its inverted half-wave rectified version in a 1-to-2 ratio, as depicted in Fig. 12, we obtain precision full-wave rectification. Prove that this circuit yields