### Plot ratio of Bessel functions

I am new to SageMath and to this page. I'm running this version:

`SageMath version 9.2, Release Date: 2020-10-24 Using Python 3.8.5.`

I tried to ~~define a function ~~plot the ratio of two functions related to Bessel functions.

First I defined `f`

as the ~~ratio between the ~~first ~~derivative
~~derivative of `bessel_J(1, x)`

~~ ~~ and `g`

as `x*bessel_J(1, x)`

:

```
f(x) = bessel_J(1, x)
g = derivative(f, x)
```

Then I defined `h`

as their ratio:

```
h = g / (x*f)
```

Then, I tried to plot `h`

with:

```
plot(h, (x, 0, 10))
```

The result is an empty plot, showing only the x, y axes, and this is not correct.

Am I doing something wrong? Is it possible to plot such a function and, if yes, how?