A result like this appears as one of the terms when I compute coefficients in a Fourier Series:

```
expr =(Sin(n*Pi))/((-4 + n^2))
```

If I simplify all my terms, this happens:

```
Simplify(expr, Assumptions -> Element(n, Integers)) (*returns a zero*)
```

Which is true except if n=-2 or 2:

```
Limit(expr, n -> 2) (*give Pi/4*)
```

Shouldn’t Simplify catching that?