Echo's rich text editor allows users to add math expressions, formulas, and equations. For example, Echo will convert the text string: sum_(k=1)^n k = 1+2+ cdots +n=(n(n+1))/2

Echo's **Insert Equation** feature supports three languages:

- Ascii Math (preferred)
- LaTeX
- MathML

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**NOTE:** It may be necessary to add cdnjs.cloudflare.com to your district's website whitelist for this feature to work.

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## Adding Math Expressions

To insert a math expression into the **Rich Text Editor**:

- Place your curser at the desired location and click the Insert Equation button in the Rich Text Editor's menu bar.
- Enter the Ascii Math, LaTeX, or MathML text string.
- Use preview pane to confirm that the equation is correct.
- Click
**Save**when done.

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Here is how it looks for students.

Echo is constantly being improved based on the feedback from users and we strive to keep our documentation up to date. If this document doesn’t match what you are seeing in Echo, please let us know.

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