Algebra and Trigonometry with Analytic Geometry
Key differences between 13th and 12th editions
 Period between current and previous publications: 4 years (2011 vs 2007).
 The Thirteenth edition of Algebra and Trigonometry textbook hasn't changed much from its predecessor.
 About 650 new exercises and 11 new examples  in other words almost 20% of the exercises are new or updated.
 New Chapter Tests feature at the end of each chapter contain questions that are representative of exercises in the sections, as well as unique concept questions. These new items provide an additional source of exam questions and practice for students.
 Arrow notation is introduced earlier in Section 2.2 and revisited more often in 13th Edition, bolstering precalculus content for better preparation for calculus topics.
 New Examples:
 find the inverse of a rational function (Section 4.1, with the method for checking presented in a marginal note)
 predict a quantity using the decay formula (Section 4.3)
 how to show that an equation is not an identity (Section 6.1)
 use the subtraction formula for the cosine to find an exact value when given an exact trigonometric value and the sign of another trigonometric function (Section 6.3)
 how to find double angle values of other trigonometric functions given that the tangent of an angle is a constant (Section 6.4)
 new type of probability problem (Section 10.8).
13th Edition of
Algebra and Trigonometry with Analytic Geometry
eBook, 960 pages
eBook ISBN: 9781133037644
Published by: Wadsworth Publishing, February 01, 2013
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 $28.31 
Hardcover, 960 pages
ISBN10: 0840068522
ISBN13: 9780840068521
Published by: Cengage Learning, January 01, 2011
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plus Enhanced WebAssign Homework with eBook Printed Access Card for One Term Math and Science
Hardcover
ISBN10: 1111495912
ISBN13: 9781111495916
Published by: Cengage Learning, January 01, 2011
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12th Edition of
Algebra and Trigonometry with Analytic Geometry
with CengageNOW Printed Access Card
Hardcover, 1024 pages
ISBN10: 049510826X
ISBN13: 9780495108269
Published by: Cengage Learning, February 23, 2007
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 $48.68

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Classic Edition
Hardcover, 912 pages
ISBN10: 0495559717
ISBN13: 9780495559719
Published by: Cengage Learning, January 28, 2009
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Hardcover, 1024 pages
ISBN10: 0495383422
ISBN13: 9780495383420
Published by: Brooks Cole, February 26, 2007
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11th Edition of
Algebra and Trigonometry with Analytic Geometry
with CDROM
Hardcover, 1024 pages
ISBN10: 0534494498
ISBN13: 9780534494490
Published by: Cengage Learning, November 30, 2004
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Hardcover
 Used 13th edition can save you $49.76 over the new one.

Used previous 12th edition costs $42 less than the used 13th.