https://blog.wongcw.com/2021/11/03/microsoft-edge-beta-96%e7%99%bc%e4%bd%88%ef%bc%9a%e6%94%b9%e9%80%b2pdf%e6%bb%be%e5%8b%95-math-solver%e8%aa%ac%e6%98%8e%e8%a7%a3%e6%b1%ba%e6%95%b8%e5%ad%b8%e5%95%8f%e9%a1%8c/