Updated equations so that they are all 120dpi images.

Also tweaked a few for better readability.

[SVN r43590]

libs/math

@@ -1 +1 @@
-Subproject commit 4fb47c61e477020f16d4b2495549bd940e5f876e
+Subproject commit cbcdc42bd8596c639558f4662c35bb9131302210