Precalculus

Trigonometric Identities Video Review Lessons

Basic Trigonometric Identities
• Fundamental Trigonometric Identities
• Finding All Function Values
Simplifying Trigonometric Expressions
• Simplifying a Trigonometric Expression Using Trigonometric Identities
• Simplifying Trigonometric Expressions Involving Fractions
• Simplifying Products of Binomials Involving Trigonometric Functions
• Factoring Trigonometric Expressions
• Determining Whether a Trigonometric Function Is Odd, Even, or Neither
Proving Trigonometric Identities
• Proving an Identity
• Proving an Identity: Other Examples
Solving Trigonometric Equations
• Solving Trigonometric Equations
• Solving Trigonometric Equations by Factoring
• Solving Trigonometric Equations with Coefficients in the Argument
• Solving Trigonometric Equations Using the Quadratic Formula
• Solving Word Problems Involving Trigonometric Equations
The Sum and Difference Identities
• Identities for Sums and Differences of Angles
• Using Sum and Difference Identities
• Using Sum and Difference Identities to Simplify an Expression
Double-Angle Identities
• Confirming a Double-Angle Identity
• Using Double-Angle Identities
• Solving Word Problems Involving Multiple-Angle Identities
Other Advanced Identities
• Using a Cofunction Identity
• Using a Power-Reducing Identity
• Using Half-Angle Identities to Solve a Trigonometric Equation