I've tried variations of \frac{$\pi$}{2} without any success, while \frac seems happy to accept numbers and/English letters.
Any advice would be greatly appreciated by this newbie.

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Code: Select all
\documentclass{article}
\usepackage{amsmath}
\begin{document}
text text $\frac{\pi}{2}$ text text text text $\dfrac{\pi}{2}$ text text text text text text
\[
\frac{\pi}{2}
\]
text text text text
\begin{equation}
\frac{\pi}{2}
\end{equation}
\end{document}
Learn LaTeX easily with newest books:
The LaTeX Beginner's Guide: 2nd edition and perfect for students writing a thesis
The LaTeX Cookbook: 2nd edition full of practical examples for mathematics, physics, chemistry, and more
LaTeX Graphics with TikZ: the first book about TikZ for perfect drawings in your LaTeX thesis