Chris asks…What is the difference between a regular textbook and a "customized" textbook for a university?Regular textbook ISBN:9780534402303
http://www.amazon.com/Precalculus-Circle-Trigonometry-CD-ROM-Tutorial/dp/0534402305/ref=dp_ob_title_bk/175-5850734-9350769
Customized textbook Title: Precalculus with UNIT CIRCLE Trigonometry with Solution CD
ISBN: 9781111216931
Both textbooks are from the same author, who is COHEN.Joe answers:Usually there is not much difference between the books.
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