# Evaluating the derivative of piecewise functions

Hi,

In Sage 7.5 you can numerically evaluate the derivative of a regular symbolic expression using:

```
sage: h(x) = sin(x)
sage: diff(h)(2).n()
-0.416146836547142
```

Old **Piecewise** functions could be treated in the same way:

```
sage: g = Piecewise([([0,2], sin(x)), ((2,3), cos(x))])
... DeprecationWarning ...
sage: diff(g)(1).n()
0.540302305868140
```

However, new **piecewise** functions don't:

```
sage: f = piecewise([([0,2], sin(x)), ((2,3), cos(x))])
sage: diff(f)(1).n()
... Error ...
```

Thanks in advance.