Now consider a practical low pass filter. Write an expression for a practical low pass filter in the frequency domain that would approximately attenuate frequencies greater than 5 Hz. You will need to think about the time domain to achieve this. Explain what you are doing and write the equations. (Do not compute any convolutions in your answer. You can leave it, for example, as a(t) b(t) or A() B() or A() + B() C(). Whatever makes sense). Sketch a graph of the frequency response of your filter (amplitude only)