How much pizza and how much frozen yogurt?

As you may know, I am maintaining the Ryacas package (with online documentation) for doing symbolic mathematics (and other stuff) in R using the yacas software (with online documentation). Søren Højsgaard and I have been preparing a new major release of Ryacas (see blog post on it). We are now trying to show how to use it. To use the version, please install the development version as described at https://github.