The function has value *A* between *t *=* a* and *t *=* b * only.

Graph of `f(t)=A*[u(t-a)-u(t-b)]`.

We write the function using the rectangular pulse formula.

`f(t)=A*[u(t-a)-u(t-b)]`

We use `Lap{u(t-a)}=(e^(-as))/s`

We also use the linearity property since there are 2 items in our function.

`Lap{f(t)}=A[(e^(-as))/s-(e^(-bs))/s]`

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