To integrate the function:


```
f(t) = a * exp(-t / tau) * sinc(2 * pi * t / tau) 
```

from `T0` to `T1`, we can use integration by parts. First, let's write `f(t)` in a different form to make it easier to integrate.


```
f(t) = a * exp(-t / tau) * sinc(2 * pi * t / tau) = a * exp(-t / tau) * (sin(2 * pi * t / tau) / (2 * pi * t / tau)) = (a / (2 * pi * tau)) * (sin(2 * pi * t / tau) / t) * exp(-t / tau) 
```


Let

```
u(t) = (a / (2 * pi * tau)) * (sin(2 * pi * t / tau) / t)
```


and


```
dv(t) = exp(-t / tau) dt 
```


Then,


```
du(t) = (a / (2 * pi * tau)) * ((cos(2 * pi * t / tau) / tau) - (2 * pi * sin(2 * pi * t / tau) / t^2)) dt 
```


and


```
v(t) = -tau * exp(-t / tau) 
```


Using integration by parts, we have


```
∫(T0 to T1) f(t) dt = [u(t) * v(t)](T0 to T1) - ∫(T0 to T1) v(t) du(t) dt 
```


Evating `u(t) * v(t)` at `T1` and `T0`, we get


```

[u(t) * v(t)](T1) - [u(t) * v(t)](T0) = [(a / (2 * pi * tau)) * (sin(2 * pi * T1 / tau) / T1) * (-tau * exp(-T1 / tau)) - (a 
```


Now, let's evate `∫(T0 to T1) v(t) du(t) dt`. Using the expression for `du(t)` above, we have


```
∫(T0 to T1) v(t) du(t) dt = ∫(T0 to T1) -tau * exp(-t / tau) * (a / (2 * pi * tau)) * ((cos(2 * pi * t / tau) / tau) - (2 * pi * sin(2 * pi * t / tau) / t^2)) dt = - (a / (2 * pi * tau^2)) * [cos(2 * pi * t / tau) / t + (2 * pi * sin(2 * pi * t / tau) / t^2) - (2 * pi * cos(2 * pi * t / tau) / tau)] * exp(-t / tau)](T0 to T1) 
```


Substituting the values we obtained for `u(t) * v(t)` and ∫(T0 to T1) v(t) du(t) dt` back into the integration by parts formula, we have


```
∫(T0 to T1) f(t) dt = [(a / (2 * pi * tau)) * (sin(2 * pi * T1 / tau) / T1) * (-tau * exp(-T1 / tau))
	•	(a / (2 * pi * tau)) * (sin(2 * pi * T0 / tau) / T0) * (-tau * exp(-T0 / tau))]
	•	(a / (2 * pi * tau^2)) * [cos(2 * pi * t / tau) / t + (2 * pi * sin(2 * pi * t / tau) / t^2) - (2 * pi * cos(2 * pi * t / tau) / tau)]
exp(-t / tau)](T0 to T1)

```

Simplifying this expression, we get:


```
∫(T0 to T1) f(t) dt = (a / (2 * pi * tau)) * [(sin(2 * pi * T0 / tau) / T0) * exp(-T0 / tau) - (sin(2 * pi * T1 / tau) / T1) * exp(-T1 / tau)]

(a / (2 * pi * tau^2)) * [cos(2 * pi * T0 / tau) * (1 - exp(-(T1 - T0) / tau)) / T0
sin(2 * pi * T0 / tau) * ((T1 - T0) / tau + exp(-(T1 - T0) / tau)) / T0^2
cos(2 * pi * T1 / tau) * (1 - exp(-(T1 - T0) / tau)) / T1
sin(2 * pi * T1 / tau) * ((T1 - T0) / tau + exp(-(T1 - T0) / tau)) / T1^2]
```


This is the final expression for the integral.
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