1. The problem statement, all variables and given/known data http://postimage.org/image/fxtu2blaf/ [Broken] 2. Relevant equations With loop analysis i obtained three equations, but i guess i can't solve it. If node analysis is used there would be two equations, then I tried with node analysis. 3. The attempt at a solution http://postimage.org/image/cyswewvgr/ [Broken] It's not complete nor right I guess. PD. voltage v is noise and it equals to cos(wt). I Have done a simulation i'll add it.