If the Laplace transform of a function $f(t)\ is \frac{1}{s(s+a)}$ then $f(t)$ is equal to :
If the Laplace transform of a function $f(t)\ is \frac{1}{s(s+a)}$ then $f(t)$ is equal to :
1). $\frac{1}{a}(1-e^{-at}) $
2). $(1-e^{-at}) $
3). $\frac{1}{a}e^{-at}$
4). $ae^{-at}$
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