Just testing how to format equations from within WordPress. Press Alt-Shift-v in Firefox (Alt-v in IE and make sure the editor has focus) to bring up the advanced toolbar (I work directly in the Code editor). From the advanced toolbar, click the ‘Omega’ symbol to insert special characters (you can see the specific codes in the editor).
∫dx/√(a2–x2) = sin-1(x/a) + C
A bit cumbersome, but much easier than converting something else to images and inlining the images 🙂