When working with Julia, there are multiple ways to generate a PDF document that displays equations from a package. In this article, we will explore three different approaches to solve this problem.

## Option 1: Using LaTeX and the LaTeXStrings package

One way to generate a PDF document with equations is by using LaTeX and the LaTeXStrings package in Julia. This approach allows us to write equations in LaTeX syntax and then convert them into a PDF document.

```
using LaTeXStrings
using PDFIO
# Create a new PDF document
doc = PDFDocument()
# Add equations to the document
equation1 = L"frac{d}{dx} sin(x) = cos(x)"
equation2 = L"int_{0}^{1} x^2 dx = frac{1}{3}"
add(doc, equation1)
add(doc, equation2)
# Save the document as a PDF file
save(doc, "equations.pdf")
```

This code snippet demonstrates how to use the LaTeXStrings package to write equations in LaTeX syntax and add them to a PDF document using the PDFIO package. Finally, the document is saved as a PDF file named “equations.pdf”.

## Option 2: Using the Plots package and the PyPlot backend

Another approach to generate a PDF document with equations is by using the Plots package in Julia. This approach allows us to create plots of equations and save them as PDF files.

```
using Plots
pyplot()
# Create a plot of the equation
plot(x -> sin(x), 0, 2π, label="sin(x)")
# Save the plot as a PDF file
savefig("equation_plot.pdf")
```

This code snippet demonstrates how to use the Plots package with the PyPlot backend to create a plot of the equation “sin(x)” and save it as a PDF file named “equation_plot.pdf”.

## Option 3: Using the Documenter package

The Documenter package in Julia provides a way to generate documentation for packages, including equations. This approach allows us to write documentation in Markdown format and convert it into a PDF document.

```
using Documenter
# Create a new documentation project
makedocs("MyPackage")
# Add equations to the documentation
@doc """
# MyPackage
This is the documentation for MyPackage.
## Equations
The following equations are supported:
- `sin(x)`: computes the sine of x.
- `cos(x)`: computes the cosine of x.
"""
# Generate the PDF documentation
makedocs(format=:pdf)
```

This code snippet demonstrates how to use the Documenter package to create a new documentation project for a package and add equations to the documentation. Finally, the documentation is generated as a PDF document.

After exploring these three options, it is clear that the best approach depends on the specific requirements of the project. If the goal is to generate a PDF document with equations written in LaTeX syntax, Option 1 using the LaTeXStrings and PDFIO packages is the most suitable. However, if the goal is to create plots of equations, Option 2 using the Plots package with the PyPlot backend is the better choice. Lastly, if the goal is to generate documentation for a package that includes equations, Option 3 using the Documenter package is the most appropriate.