How to write equations in Blogspot/Blogger without using any code

I found a trick to show or write latex equations in blogspot just like this one without adding additional codes and using special characters. 

Take a look at the pretty equation below. 

How to do it? 

Instead of hardcoding latex codes when writing and adding javascripts into the theme, I used the online latex writer/editor "https://latex.codecogs.com/eqneditor/editor.php" to write the equations. 

Once the equation is rendered, I highlight the equation, ctrl+c, then paste it into the text field of Blogspot. 

Easy right?