1. The problem statement, all variables and given/known data Rearrange f(t) using Heaviside Step Function Then Rearrange it so that the Laplace Transform can be written down Then, Write the Laplace Transform of f(t) 2. Relevant equations 3. The attempt at a solution So my first step is as follows... Using the basic Piecewise Function in terms of Unit Functions formulae f(t) = 0 -cos(2∏t)H(t-3)-cos(2∏t)H(t-6) Which I've then rearranged into... f(t) = 0 -cos(2∏(t-3))H(t-3) - cos(2∏(t-6))H(t-6) Then transformed into... Sorry, couldn't use the Math editor for this :/ http://img837.imageshack.us/img837/9594/1bff76145aea4f8f8f2dcbd.png [Broken] Is this right? All help appreciated thanks!