4.1 Definitions & Basics

• Unit Circle
• Inverse, Reciprocal & Power Notation
• Even/Odd Identities & Reflections
• Cofunctions & Complementary Angle Identities
• Graphs

4.2 Complex Unit Circle

4.3 Common Identities

• Right Angle Identities
• Law of Sines
• Law of Cosines
• Sum & Difference Identities
• Product-to-Sum Identities
• Sum-to-Product Identities
• Double Angle Identities
• Half Angle Identities
• Square Identities
• Functions of Inverses

4.4 Polar & Parametric Graphing

• Polar ↔ Rectangular Conversion
• Parametric ↔ Rectangular Conversion