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**1. Homework Statement**

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. Homework 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!

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