- PrecalculusPythagorean Trigonometric Identity (1)Trig ID Movie (II)Trig ID Movie (III)Sine and Cosecant Functions (Special Property)Sine IdentityCosine and Secant Functions (Special Property)Cosine IdentityTangent and Cotangent Functions (Special Property)Tangent IdentityTrig Identities from Similar Right Triangles (I)Trig Identities from Similar Right Triangles (II)Sine & Cosine of a Sum: DiscoveryTangent of a Sum: DiscoveryBizzare Trig Identity?3 Squares ProblemA Very Unusual Trig IdentityLaw of Sines (& Area)Law of Cosines: DiscoveryWhat "CO" in COsine Means1 Radian: Clear DefinitionMovie: Radians to RevsIdentifying Sides of Right TrianglesRight Triangle Trigonometry: IntroTrigonometric Ratios (Right Triangle Context)Trig Function Values (30 Degrees)Trig Function Values (45 Degrees)Trig Function Values (60 Degrees)How Fast are You Spinning?Regular Polygons: Perimeter & AreaSOH-CAH-TOA's Failure (II)The 3 Main Trigonometric RatiosTrue Meanings of the 3 Trigonometric Ratios within a Right Triangle Context30-60-90 TriangleEven Functions!Odd Functions (Another Look)Graphing Sine & Cosine Functions (II)Exponential Functions: GraphsLogarithmic Functions: GraphsExponential Functions (Graph & Equation Anatomy)Logarithmic Functions (Graph & Equation Anatomy)Half-Life FunctionAnimation 159Inverse Relations: Graphs