I use XCAS for Windows and am impressed with its power. This application allows one to carry a superior CAS and plotting system in ones pocket. The UI is very intuitive and comprehensive, exposing the power of the underlying math engine. The document paradigm is very useful, allowing for the compartmentalization of projects. Excellent tutorial material and function help. Highly recommend this app.
JK121231234 about Mathematics with PocketCAS Pro, v3.7.5