The current I(t) in a certain LRC circuit obeys the differential equation 4I'' + 12I' + 25I = 10cos(5t/2) + 10sin(5t/2), with initial conditions I(0) = 0 and I'(0) = 0. Determine and identify its transient and steady state parts.
Now assume the circuit has no resistance, so the differential equation becomes 4I'' + 25I = 10cos(5t/2) + 10sin(5t/2). Solve the initial value problem for the current I(t) if I(0) = 0 and I'(0) = 0.