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## Homework Statement

I am using the time differentiation property to find the fourier transform of the following function:

## Homework Equations

f(t)=2r(t)-2r(t-1)-2u(t-2)

## The Attempt at a Solution

f'(t)=2u(t)-2u(t-1)-2δ(t-2)

f''(t)=2δ(t)-2δ(t-1)-???????

Can somebody explain what the derivative of the dirac delta function is?