http://mathjs.org/
https://github.com/josdejong/mathjs

http://mathjs.org/docs/index.html
http://mathjs.org/docs/getting_started.html
http://mathjs.org/examples/index.html

http://mathnotepad.com/
http://jsbin.com/devacu/edit?html,css,output

2020
https://blog.klipse.tech/javascript/2020/09/10/symbolic-computation-math-js.html