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!
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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.
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$\begingroup$ To see the source you can also click on "edit". I find this more useful, as you get to see the bigger picture (including how links are formatted, etc.). $\endgroup$ – user1729 Jul 12 '20 at 21:04
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$\begingroup$ True, @user1729, provided the equation of interest is in a question or answer. But sometimes knowing to right click is useful across questions, answers, AND COMMENTS. $\endgroup$ – amWhy Jul 12 '20 at 21:07
\tag{some number/symbol}). $\endgroup$ – Bernard Jul 12 '20 at 13:19$signs for inline maths (e.g. $a + b^2 = 10$) or$$signs for equations that take their own line, e.g. $$\int_{-\infty}^\infty e^{-x^2} \, \mathrm{d}x = \sqrt{\pi}.$$ $\endgroup$ – user804886 Jul 12 '20 at 14:58