Lesson Plan: Evaluating Trigonometric Functions Using Cofunction Identities | Nagwa Lesson Plan: Evaluating Trigonometric Functions Using Cofunction Identities | Nagwa

# 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.

#### Objectives

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).

#### Prerequisites

Students should already be familiar with

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

#### Exclusions

Students will not cover

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