A calculator or computer can not only be a useful tool to save time and check arithmetic, but also to do calculations, draw pictures, and make explorations which would not be manageable otherwise.  However, you should not become overly dependent on your calculator or computer.  There are basic skills in calculus which we believe you should be able to carry out "by hand."  Therefore some quizzes, tests, or parts of tests may be designated as "no calculators allowed."  (If we decide to exclude calculators on a particular test, you will be warned in advance.)

Any graphing calculator is acceptable for your personal use in study and on homework assignments.  However, some fancier calculators contain a "computer algebra system" (CAS) that allows them to perform symbolic manipulations. Calculators containing a CAS (for example, the TI-89, TI-92, HP-48 and HP-49) are not allowed at quizzes and exams.  Using one falls into the category of exam cheating and as such will be taken very seriously.. Therefore it's wise not to become dependent on a CAS while studying.