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# Time for action - PDF output from the notebook interface

Enter the following code into an input cell in a worksheet, and evaluate the cell.

```var('n,x,t')
J_n(n,x) = 1/pi*integral(cos(n*t-x*sin(t)), t)
J_n
show(J_n)
view(J_n)
view(J_n, mode='display'))
```

You should see the following results in your worksheet:

Let's say you want to generate a PDF file. Enter the following code after evaluating the code from the first example:

```restore('i'))
J_n_2(n, x) = 1 / (2 * pi) * integral(exp(-i * (n * t - x * sin(t))),
t, -pi, pi)
view([J_n, J_n_2], title='Representations of the Bessel function',,
sep='\hrule', viewer='pdf', mode='display')
```

You will not see any ...

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