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I'm stuck on a dynamic systems question, it's attached as a jpeg

I started off by writing nodal equations for each node:

Node 1: 1/R1(ei-eA)=C1D(eA-eo)+1/R2(eA-eB)

Node 2:1/R2(eA-eB)=C2D(eB)

I know that I have to isolate for ei and eo but I'm really confused with the D^2 that's in the answer. Any help is greatly appreciated! :)

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# Homework Help: Find the Differential Equation Relating Input Voltage and Output Voltage

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