# PreCalculus

## PreCalculus

Trigonometry, identities, polar equations, logarithms, sequences, limits and other topics to prepare for calculus

### Sample Lesson

• Pythagorean Theorem
• Special Right Triangles (30°- 60°- 90° and 45°- 45°- 90°)
• Trigonometric Ratios
• Inverse Trigonometric Ratios
• Interpreting the Trigonometry Tables
• Using the Trig. Table to Solve for the Unknown
• Using a Calculator and Arc Functions
• Angles of Elevation and Depression
• Angles less than 0°
• Angles greater than 360°
• Reference Angles
• Cofunctions
• Negative Angle Relationships
• Proving Trigonometric Identities
• Sum and Difference Identities
• Double-Angle and Half-Angle Identities
• Law of Sines
• Law of Cosines
• Ambiguity in the Law of Sines
• Polar Coordinates and Rectangular Coordinates
• Polar Equations and Polar Graphs
• Vectors
• Functions: Relation, Domain, and Range
• Graphing the Sine and Cosine Functions
• Graphing the Secant and Cosecant Functions
• Graphing the Tangent and Cotangent Functions
• Logarithms
• Arithmetic Sequences and Series
• Geometric Sequences and Series
• Proof of Cos (A - B) = Cos A Cos B + Sin A Sin B
• Finding the Area of a Triangle Trigonometrically
• Interpolation
• Natural Logarithms
• Equations with Absolute Value