The Connexions Math Editor allows you to create and
edit MathML expressions. To copy an expression to your clipboard
double-click inside the editing box but outside the text of
the expression, or press Ctrl+A (Select All).
Then, press Ctrl+C (Copy) to copy the MathML.
Return to your module, place
your cursor in the editing area (either Edit-In-Place or Full-Source) and
press Ctrl+V (Paste) to insert the MathML equation. For more information,
read the Math Editor
quickstart,
intermediate examples, and
reference manual.