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Douglas Downing
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Barron's Trigonometry the Easy Way Subsequent Edition

by Douglas Downing (Author)
4.3 4.3 out of 5 stars 31 ratings
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Explains the principles of trigonometry and includes practice exercises with answers.
Previous page
  1. ISBN-10
    0812043898
  2. ISBN-13
    978-0812043891
  3. Edition
    Subsequent
  4. Publisher
    B E S Pub Co
  5. Publication date
    January 1, 1990
  6. Language
    English
  7. Dimensions
    7.75 x 0.75 x 10.75 inches
  8. Print length
    310 pages
  9. See all details
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Product details

  • Publisher ‏ : ‎ B E S Pub Co; Subsequent edition (January 1, 1990)
  • Language ‏ : ‎ English
  • Paperback ‏ : ‎ 310 pages
  • ISBN-10 ‏ : ‎ 0812043898
  • ISBN-13 ‏ : ‎ 978-0812043891
  • Item Weight ‏ : ‎ 1.45 pounds
  • Dimensions ‏ : ‎ 7.75 x 0.75 x 10.75 inches
  • Customer Reviews:
    4.3 4.3 out of 5 stars 31 ratings

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Douglas Downing

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Customer reviews

4.3 out of 5 stars
4.3 out of 5
31 global ratings

Top reviews from the United States

Dorian Roffe-Hammond
5.0 out of 5 stars In Perfect condition
Reviewed in the United States on August 11, 2023
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Very pleased with this purchase. The price was great and the condition of the the book was perfect. And the delivery time was fast.
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Sara Fischer
4.0 out of 5 stars Descent Book
Reviewed in the United States on April 30, 2012
Verified Purchase
Great book and good review of Trigonometry. Got a bit wordy but works well. I use it mostly for different explanations for my students
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The Savage Wombat
5.0 out of 5 stars Trig? Entertaining? Wait a minute!
Reviewed in the United States on October 25, 2010
Verified Purchase
Creating a story to help students learn math is long overdue. While the story isn't necessarily the greatest, anything that gives the student something to associate the concepts with is a helpful memory aid. This is a step in the right direction. Now a Trig cartoon or something would be really great.
One person found this helpful
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J. S. Shin
3.0 out of 5 stars It's the easy way but somewhat incomplete way
Reviewed in the United States on August 31, 2001
I have read second edition of this book.I like the early chapters of this book. It's fun and easy to understand.
But there are some major errors and the book explains some concepts in a too much incomplete inductive way.
To begin with, the standing wave formula in the chapter 9 is different from the formula on many other college physics books.
This book says it Y=Asin(kx)sin(wt). But all other college physics books say it Y=Asin(kx)cos(wt).:-<
Another example, the answer to the exercise number 47 of the chapter 10 of this book, there is only one value for the x. Actually, there are two values. And if you seleted the same way with this book to solve this problem, you have to consider another value. Not just discard the extraneous root! Since the root value have to be interpreted to a value for the cosine as well as sine, because the quadratic equation formed exactly same with the case of cosine.
Additional example is the answer to the exercise number 57 of the chapter 10. The book omits two values. This error is very related with the concepts of chapter 12.
Furthermore, the book explains some concepts in a too much incomplete inductive way. An inductive way does not guarantee a theorem is true(well, the mathematical induction is an exception) . So it must used in a careful way. But this book abuse it. For example, see the exercise number 41 of the chapter 14. The book explains(actually make reader think by solving a problem) the existance of the polar triangle by just calculate a single instance of a spherical triangle. I think it must be presented by proving cosBcosC-sinBsinCcosa equals to -cosA by applying the law of cosines for sides and the fact sinBsinC becomes bc(1-(cosA)^2)/((sina)^2).Despite of the fact it may lead to a clumsy algebric experience.
In conclusion, although you may become friendly with the trigonometry functions with this book, you are still ambiguous and skeptical about some of the trigonometric concepts.You have to create your own exercises to make sure what you've learn from this book.:-<
14 people found this helpful
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David J. Houston
5.0 out of 5 stars Had it before but mispaced it
Reviewed in the United States on January 20, 2014
Verified Purchase
I enjoyed it as an entertainment book with characatures in the subject. How is that for math study. It beats boredom.
One person found this helpful
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Amazon Customer
5.0 out of 5 stars Five Stars
Reviewed in the United States on October 27, 2015
Verified Purchase
Great book at a great price. Helped me a lot
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Steven P Fontes
4.0 out of 5 stars I got a nice solid refresher foundation off of
Reviewed in the United States on November 27, 2014
Verified Purchase
broken down fairly simple. I got a nice solid refresher foundation off of this
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Alice Cotton-royer
5.0 out of 5 stars Trig stories
Reviewed in the United States on August 7, 2007
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This is a great resource for teachers who want to teach the difficult concept of trigonometry in a simple, steady fashion - through the use of story telling.

I like it over the textbook approach.
One person found this helpful
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Kindle Customer
5.0 out of 5 stars ☆三角関数－おとぎ話バージョン☆
Reviewed in Japan on November 1, 2015
Verified Purchase
自分がその昔読んだ本ですが、子供が読む年齢に☆楽しい本です！
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