【解决】ParseError: KaTeX parse error: \cr valid only within a tabular/array environment

使用array即可，如：

效果一

$\begin{array}{cc}
1\\2
\end{array}$

或

$\begin{array}{cc}1\\2\end{array}$

$\begin{array}{c}1\\ 2\end{array}$

效果二

$\begin{array}{cc}
\LARGE f(x)=\frac{1}{\sqrt{2\pi}\sigma}e^{-\frac{(x-\mu)^2}{2\sigma^2}}\\(-\infty<x<+\infty)
\end{array}$

$\begin{array}{c}f(x)=\frac{1}{\sqrt{2\pi }\sigma }{e}^{-\frac{(x-\mu {)}^2}{2{\sigma }^2}}\\ (-\infty <x<+\infty )\end{array}$