Table of Contents

1. Triangle Trig
   1. Right Triangle Trigonometry Ratios
   2. Law of Sines - Ambiguous Case
   3. Law of Cosines (Circle Proof)
   4. Law of Cosines - Geometric Interpretation
2. Circular Trig & Waves
   1. What is a radian?
   2. Circular Trigonometry Definitions
   3. Common Transformations of the rotation angle
   4. Trigonometry Ratio Graph from Unit Circle
   5. Sine Wave Sounds
   6. Trig Circle: Coordinates of Special Angle Values
   7. Trigonometry - Geometric Definitions in a Unit Circle
   8. Trigonometry - Pythagorean Identities Geometrically
3. Sum/Difference Formulas
   1. Sine & Cosine of a Sum: Discovery
   2. Sine and Cosine Sum and Difference Proofs
4. Misc. Other Trig Stuff
   1. Polar vs Cartesian Functions
   2. Interactive Polygonal Sinusoids
   3. Spline Trigonometry
   4. Zeros of sin(lnx)
   5. Trig Identities from Euler's Formula