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## Homework Statement

f(t) = (1/(a^2))(1-e^-at - ate^-at)

## Homework Equations

f(t) = (1/a)(1-e^(-at))

F(s) = 1/s(s+a)

f(t) = t e^(-at)

F(s) = 1/(s+a)^2

## The Attempt at a Solution

F(s) = (1/s(s+a^2)) - (1/(s+a)^2)

Totally lost now, but I think this is wrong anyway, can anyone help me please. I know the answer is

F(s) = 1/(s + a)^2

but I have no idea why.

Kind Regards

Rob K

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