Why is Trigonometry so important?

How to Prove Trigonometric Identities (and how not to)

Intro to Trigonometric Functions (1 of 2: Angles of any magnitude)

Defining the Trigonometric Ratios

Redefining the Trig Functions on the Unit Circle (1 of 2: The Basic Concept)

Trigonometry on the Unit Circle (1 of 3: Introduction)

Why are Sine & Cosine given their names?

3D Trigonometry Example (1 of 2: Setting up the triangles)

Using the Trigonometric Ratios

Redefining the Trig Functions on the Unit Circle (2 of 2: Understanding Non-Acute Angles)

Solving Trigonometric Equations (1 of 5: Overview)

The Basic Trig Ratios & their Reciprocals

How to Graph Trigonometric Functions (1 of 2: Sine)

Solving Trigonometric Equations (1 of 4: Simplest Example)

Integrating Trigonometric Functions (1 of 4): The Basics

Trigonometry on the Unit Circle (2 of 3: Full redefinition)

Calculus of Trigonometric Functions (1 of 3: Using visual intuition)

6÷2(1+2)=???

Using t-results to Solve Trigonometric Equations (Example 1)

Graphing Trigonometric Functions