# Trig without Tears

or, How to Remember Trigonometric Identities

revised 13 Apr 2014

Copyright © 1997–2014 Stan Brown, Oak Road Systems

or, How to Remember Trigonometric Identities

revised 13 Apr 2014

Copyright © 1997–2014 Stan Brown, Oak Road Systems

**Summary:**
Faced with the large number of trigonometric identities, students
tend to try to **memorize them all**. That way lies **disaster**. When
you memorize a formula by rote, you have no way to know whether you’re
remembering it correctly. I believe it is **much more effective** (and, in
the long run, **much easier**) to understand thoroughly how the trig
functions work, memorize **half a dozen formulas**, and work out
the rest as needed. That’s what these pages show you how to do.

**Versions:**
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version is available for reading off line.

**Copying:**
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of this page for your own use, and to link from your own Web pages to
this page. But please don’t make any electronic copies and publish
them on your Web page or elsewhere.

start: 1/Introduction

**Q. Why aren’t the pages on this site laid out better?**

A. They would look better in a browser that can handle stylesheets reasonably well, but there is no need to change browsers. All the content on this site is accessible to you no matter which browser you use.

If you nonetheless have trouble reading the site, or something just looks strange, please let me know which browser you are using and what the problem is.

this page: http://oakroadsystems.com/twt/

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