6  Trigonometric Identities and Equations

6.1 Proving What’s True: Verifying Trigonometric Identities

This section is under development.

6.2 Adding Angles: Sum and Difference Formulas

This section is under development.

6.3 Doubling and Halving: Double-Angle and Half-Angle Formulas

This section is under development.

6.4 Finding the Unknown: Trigonometric Equations

This section is under development.