1. The problem statement, all variables and given/known data Low-pass filter allows signals of low frequency to pass while attenuating high frequency signals; similarly, a high-pass filter allows signals of high frequency to pass while attenuating low frequency signals. The signals here can refer to voltage or current in the circuit. There is a link to a picture. I don't quite understand how to solve it. Link: http://img198.imageshack.us/img198/5677/mathb.png [Broken] 2. Relevant equations I understand that Vin = Vc + Vr. How do I use Laplace transform on Vin = Vc + Vr. AnD if Vout is the voltage across the resistor R. 3. The attempt at a solution I am totally stuck.