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\documentclass{article}
\usepackage{amsmath, tikz}
\begin{document}
\section{Fourier Transform}
The Fourier transform of $f(x)$:
\[
\hat{f}(\xi)=\int f(x)e^{-2\pi ix\xi}\,dx
\]
\end{document}
1. Fourier Transform
The Fourier transform of f(x):
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