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\usepackage{amsmath}% For the equation* environment
\begin{document}
\section{First example}
The well-known Pythagorean theorem \(x^2 + y^2 = z^2\) was proved to be invalid for other exponents, meaning the next equation has no integer solutions for \(n>2\):
\[ x^n + y^n = z^n \]
\section{Second example}
This is a simple math expression \(\sqrt{x^2+1}\) inside text.
And this is also the same:
\begin{math}
\sqrt{x^2+1}
\end{math}
but by using another command.
This is a simple math expression without numbering