\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{align*}
	x^2+y^2 &= z^2
\end{align*}


\begin{equation*}
	\zeta(s) = \sum_{n=1}^\infty \frac{1}{n^s}
\end{equation*}

\end{document}
