UCSS Math II 5.9.4 Example 1

Author:
Walch Education
Prove the Pythagorean identity sin cos.
GeoGebra Applet
  1. Draw a labeled diagram of a right triangle.
  2. Apply the Pythagorean Theorem to this triangle.
  3. Divide both sides of this equation by .
  4. Rewrite this equation using the laws of exponents.
  5. Find sin and cos by looking at the diagram.
  6. Substitute sin and cos into the equation from step 4.
  7. Rewrite the equation using the standard notation for trigonometric functions with exponents.
This applet is provided by Walch Education as supplemental material for the UCSS Secondary Math II program. Visit www.walch.com for more information on our resources.

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