One time-saving use for teachers is writing questions with certain properties. For example if you know you want a cubic with a repeated root you could multiply out appropriate brackets by hand, or you could use CAS to do it:
Similarly you may want a quadratic with specific complex roots:
Most CAS engines also feature calculus tools too so you could use the integration function to find a function with a specific derivative:
In addition to using CAS to write questions teachers can also use to check students' answers.
There are many CAS tools available. The three that I have used here are:
- TI-nspire http://education.ti.com/html/nspire_uk/ (this is available as a CAS and non-CAS version - students will likely want to buy the non-CAS version so they can use it in exams but teachers are advised to buy the CAS version)
- Microsoft Mathematics http://www.microsoft.com/education/products/student/math/ (free download)
- Maxima http://maxima.sourceforge.net/ (open-source, free download)