A lithium-ion battery can be described by the equivalent circuit model below: ww R1 ww R2 C1 i ( C2 (a) Determine the total impedance Ztot (s). Specifically, find the coefficients a, bo, b, and b below. Note that the coefficient of s in the denominator is 1. (b) Determine Y(s) U(s) = Ztot(s) = V(s) I(s) = bus + bis + bo s + s +0 G(S), with control input U(s) = I(s) and Y(s) analogous to an internal charge state within the battery. Use the formula below, with N(s) = bs + bs + bo and y is an unknown, constant parameter. Y(s) U(s) = G(s) = Ztot(s) N(s)