Welcome to Trigonometry Online
  • Home
  • Algbebra Review
    • Moving Graphs
    • Composing Functions
    • Quizzes
    • Discussion Post
    • Feedback Survey
  • Trig Functions
    • Intro to Trig Functions
    • Finding side lengths
    • Finding Angle Measures
    • Special Right Triangles
    • Quizzes
    • Discussion Post
    • Feedback Survey
  • Unit Circle
    • Angles and Degrees
    • Angles and Radians
    • Quizzes
    • Discussion Post
    • Feedback Survey
  • Transformations
    • Pre-Knowledge
    • Graphing Sin and Cos
    • Graphing Sec and Csc
    • Graphing Tan and Cot
    • Real World Application
    • Quizzes
    • Test
    • Discussion Post
    • Feedback Survey
  • Identities
    • Pre-Knowledge
    • Pythagorean Identities
    • Odd & Even
    • Sum & Difference
    • Quizzes
    • Feedback Survey
  • Equations
    • Half Angle
    • Double Angle
    • Solving
    • Quizzes
    • Feedback Survey
  • Law of Sin & Cos
    • Law of Sines
    • Law of Cosine
    • Solving Triangles
    • Area of Trigangles
    • Quizzes
    • Feedback Survey
  • Contact

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:

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