1. The problem statement, all variables and given/known data http://www.wifstrand.se/albert/stuff/p7.7-1.png [Broken] 2. Relevant equations vL = L * (diL / dt). All of the inductors can be reduced to a single 8 H inductor, so iL = (6 / 8) * ∫ cos 100t dt = 0.0075 sin 100t if you integrate from 0 to t. 3. The attempt at a solution The formula states that iL = iL(t0) + ∫ vL dt if you integrate from some initial condition current t0 to t. I get the correct answer if I integrate from 0 to t, but I fail to see what iL(t0) is and how we can use 0 for the lower bound. It seems as if we can just assume that t0 = 0 and that iL(t0) = 0, if so, why is that?