NOTE- Images are thumbnails, click to enlarge 1. The problem statement, all variables and given/known data Show that the positive feedback gain expression for the circuit below is v2/v0 = 1/[3 + j(wL/R - R/WL)] (anything in red I added to the original problem) 2. Relevant equations (above) 3. The attempt at a solution Along with the below calculations, I also attempted to combine the components but that didn't work either. I combined R and L2 in series, those in parallel with the other R and then in series with L1 (let's call all of that Zt). I then said (V2-V0)/Zt = 0 and proceeded to solve for V2/V0 but did not get the right answer. I thought that that should work since this is an ideal op-amp and no current is flowing between L2 and R, but alas I did not get the correct answer. Any guidance?