Hello, good evening.

Im solving some differentiation and I dont know how to make a result from expand_derivative function from Symbolics callable. This will enhance my workflow. Is there a way to do?

```
@variables t
i = 10-10ℯ^-2t
Dt = Differential(t)
current = Dt(i)
@info current
dft = expand_derivatives(current)
@info dft # ******************* make dft callable
md"""
The result is $(20ℯ^-2) mA
"""
```