When it comes to capacitive stylus, I believe price is a good signal of quality. I have tried both high end (e.g., boxwave) and low end (generic, bundled with other accessories), and the difference is very noticeable. Good luck taking math notes.... I am an economist and my note-taking involves math too. You are going to have a hard time getting good results. I tried doing this, but had to go back to my clunky convertible tablet to get the results I needed. Unless you get a slate with a digitizer (like the Flyer or the Thinkpad), you are pretty much out of luck.
As u guys know capacitive stylus have a very wide point so that it can be recognized by the device, therefore affecting precision. Thankfully some people already came up with a solution. U have to options.
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