You equation for node D doesn't look correct.
The opamp output terminal will be driving current into the circuit.
If you are not sure what to do - perhaps try deriving the transfer function of the lower feedback integrator stage which relates VD to Vo. This is quite valid.
The opamp output terminal will be driving current into the circuit.
If you are not sure what to do - perhaps try deriving the transfer function of the lower feedback integrator stage which relates VD to Vo. This is quite valid.
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