How can I edit my own questions and answers for example, give the symbols for pi, integration, and draw diagrams


You are looking for the Notation page. It provides a mini-tutorial on the use of inline equations and centered equations. For pi, you want \pi and for integrals, you want \int (I'd wrap those with $ to start MathJax, but it is not enabled on Meta).

Sadly, there is no method to draw figures via tikz or \includegraphics in the normal Latex methods. However, there is a button to include the graphics (circled below):

enter image description here

which can be used to pull an image from a website or from your computer. Also sadly, there is not an easy way to center the image.

  • $\begingroup$ For diagrams I find Google Draw to be good enough for most things. I draw the diagram in Google Draw then screen grab it and paste into Paint Shop Pro (other image editing apps are available). For graphs I use Excel, but Google Sheets is pretty good and free. $\endgroup$ – John Rennie Mar 27 '15 at 6:23

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