It's been my experience that taking notes on a computer in math classes is generally a bad idea. Even if you're able to capture all the necessary equations, there's no way you can embed diagrams on the fly, even with a good, dedicated editor. Though using the computer to take notes could certainly work in, say, a history course, I find that paper and pencil are still the best tools for the job of taking notes in math class.

Because it's not by Google, but only using Google APIs.