For Mac users, you can also use the built-in 'Grapher' application which comes with a decent GUI for writing equations/formulas. 1) Open up the 'Grapher' appli

For Mac users, you can also use the built-in 'Grapher' application which comes with a decent GUI for writing equations/formulas. 1) Open up the 'Grapher' application from the 'Applications/Utilities' folder. 2) Click on 'Choose' (it doesn't matter what other options you pick from the initial loading screen). 3) From here on, just type your equation into the main input field. You can also use the equation palette from the dropdown menu on the right side of the main input field to access the templates for things like integrals and summations. From the dropdown, you should be able to click on 'Show Equation Palette' to get a window of all of the math symbols Grapher supports. 4) Once done writing your equation, select it all, right click, and then click on 'Copy LaTeX Expression'.