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You can insert equations that use LaTeX markup using the LaTeX Math Formula Block macro. For example, you can create this formula:
| Mathblock |
|---|
\left(\, \sum_{k=1}^n a_k b_k \right)^2 \le \left(\, \sum_{k=1}^n a_k^2 \right) \left(\, \sum_{k=1}^n b_k^2 \right) |
by choosing Insert -> Other Macros -> Formatting -> Math Block (or search for Math Formula) Insert → LaTeX Math Block. Then enter the following in the LaTeX Math Formula macro Block box:
\left(\, \sum_{k=1}^n a_k b_k \right)^2 \le \left(\, \sum_{k=1}^n a_k^2 \right) \left(\, \sum_{k=1}^n b_k^2 \right)...