You can type most equations in UnicodeMath quickly by using Math AutoCorrect codes. In Latex you can easily write the equations using the commands. LaTeX2e in 90 minutes by Tobias Oetiker Hubert.
Online LaTeX equation editor generate your mathematical expressions using LaTeX with a simple way.
LaTeX Math Symbols The following tables are extracted from The Not So Short Introduction to LaTeX2e aka. In the first part of the document you find the examples. It is important to keep in mind that LaTeX has its own way of handling spacing in mathematics mode. When given it selects an internal label for the equation by which it can be cross-referenced and causes an equation number to be issued.