What is the difference between a regular textbook and a "customized" textbook for a university?

What is the difference between a regular textbook and a "customized" for a university?

Regular textbook ISBN:9780534402303



http://www.amazon.com/Precalculus-Circle鈥?/a>



Customized textbook Title: Precalculus with UNIT CIRCLE Trigonometry with Solution CD

ISBN: 9781111216931



Both textbooks are from the same author, who is COHEN. And they are both the 4th edition.What is the difference between a regular textbook and a "customized" textbook for a university?
usually there is no difference other than price. ask your professor if its okay to get the regular version.What is the difference between a regular textbook and a "customized" textbook for a university?
A customized text may combine two or more diffent textbooks and contain only select chapters for the school. http://www.greentextbooks.com/

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