5.2 Traditional Differential Equations Approach
KVL for the RL circuit below yields the differential equation: 2(di(t)/dt) + 3i(t) = 10cos(3t)
The mathematical objective is to find a particular solution of the equation (i.e., any solution that will satisfy the equation)
The standard approach is to choose i(t) = ICcos3t + ISsin3t (an educated guess, but why?)