Lesson Plan: Evaluating Trigonometric Functions Using Cofunction Identities Mathematics

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to use cofunction and odd/even identities to find the values of trigonometric functions.


Students will be able to

  • simplify trigonometric functions using cofunction identities and odd/even function identities,
  • evaluate simplified trigonometric functions using exact trigonometric ratios (or other identities such as the Pythagorean identity).


Students should already be familiar with

  • cofunction identities and relationships,
  • odd/even function identities,
  • exact trigonometric ratios,
  • Pythagorean identities.


Students will not cover

  • evaluating arbitrary angles of trigonometric functions (requiring a calculator).

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