Objective

To use the Pythagorean theorem to make a trig identity using sin x and cos x.

Web Resources

http://www.regentsprep.org/Regents/math/algtrig/ATT9/pythagoreanid.htm        Great visual notes with simple examples.

http://www.coolmath.com/precalculus-review-calculus-intro/precalculus-trigonometry/29-the-pythagorean-identities-01.htm       Colorful notes for finding all six identities

http://www.regentsprep.org/Regents/math/algtrig/ATT9/pythpractice.htm        Practice Problems with answers

http://www.regentsprep.org/Regents/math/algtrig/ATT9/morepythag.htm        Using Pythagorean Identities, the answers are given with step-by-step explanations

Lesson Video

Pay attention to the following: