How do I write the mathematical equations in a question, here on stack exchange?
When I try to write a question which involves equations, I get stuck as I don't know how to input those equations...
Anyone please tell me!
For those with little experience in LaTeX, the best on-site source to consult is mathjax basic tutorial and quck reference. This site uses MathJax software and MathJax relies a lot on LaTeX commands (not all), surrounded by dollar-signs. The tutorial will help you get up to speed in no time.
When I started here, I became very familiar with MathJax by studying the tutorial, and suggesting edits to posts, using what I learned. Until a user has earned 2000 in rep, any successful edit will earn you 2 reputation points. It's a great way to practice what you're learning.
Also, whenever you see something formatted and want to know how to do that, you can "right-click" on the formatted expression/equation, choose "show math as..." and then choose "TeX", and you'll be able to see and or copy the formatting.